• OUR LADY of CZĘSTOCHOWA: st Sigismund parish church, Słomczyn, Poland; source: own collectionOUR LADY of CZĘSTOCHOWA
    St Sigismund parish church, Słomczyn, Poland
    source: own collection

Roman Catholic
St Sigismund parish
05-507 Słomczyn
85 Wiślana Str.
Konstancin deanery
Warsaw archdiocese, Poland

  • St SIGISMUND: St Sigismund parish church, Słomczyn, Poland; source: own collectionSt SIGISMUND
    St Sigismund parish church, Słomczyn, Poland
    source: own collection
  • St SIGISMUND: XIX c., feretory, St Sigismund parish church, Słomczyn, Poland; source: own collectionSt SIGISMUND
    XIX c., feretory
    St Sigismund parish church, Słomczyn, Poland
    source: own collection
  • St SIGISMUND: XIX c., feretory, St Sigismund parish church, Słomczyn, Poland; source: own collectionSt SIGISMUND
    XIX c., feretory
    St Sigismund parish church, Słomczyn, Poland
    source: own collection
  • St SIGISMUND: XIX c., feretory, St Sigismund parish church, Słomczyn, Poland; source: own collectionSt SIGISMUND
    XIX c., feretory
    St Sigismund parish church, Słomczyn, Poland
    source: own collection
  • St SIGISMUND: XIX c., feretory, St Sigismund parish church, Słomczyn, Poland; source: own collectionSt SIGISMUND
    XIX c., feretory
    St Sigismund parish church, Słomczyn, Poland
    source: own collection
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Martyrology of the clergy — Poland

XX century (1914 – 1989)

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Mieczyslav (pl. Mieczysław)


Miroslav (pl. Mirosław)

religious forename(s)

Dennis (pl. Dionizy)

  • JANISZEWSKI Mieczyslav (Fr Dennis) - Commemorative plaque, St Dominic church, Warsaw-New Town-New Town, source: own collection; CLICK TO ZOOM AND DISPLAY INFOJANISZEWSKI Mieczyslav (Fr Dennis)
    Commemorative plaque, St Dominic church, Warsaw-New Town-New Town
    source: own collection
  • JANISZEWSKI Mieczyslav (Fr Dennis) - Commemorative plaque, St Dominic church, Warsaw-New Town, source: own collection; CLICK TO ZOOM AND DISPLAY INFOJANISZEWSKI Mieczyslav (Fr Dennis)
    Commemorative plaque, St Dominic church, Warsaw-New Town
    source: own collection


religious cleric


Latin (Roman Catholic) Churchmore on
[access: 2014.09.21]


Order of Preachers (Dominican Order, Dominicans - OP)more on
[access: 2013.07.06]

diocese / province

St Hyacinth Polish Province
Military Ordinariate of Polandmore on
[access: 2014.12.20]

date and place
of death


KL Flossenbürgconcentration camp
today: n. Weiden in der Oberpfalz, Upper Palatinate reg., Bavaria state, Germany

more on
[access: 2021.05.20]

details of death

After German and Russian invasion of Poland in 09.1939 and start of the World War II, after start of German occupation, volunteered in 1943— with his Congregation's superiors permission and Kraków archbishop, Card.

Adam Sapieha's, knowledge — for work in Germany in order to minister to Poles slaving as forced labourers.

The trip was also organised and supported by the Highest Command of clandestine Polish resistance Home Army AK (part of Polish Clandestine State).

Underwent — together with c. 30 other Catholic priests who decided to travel to Germany —extensive AK training in Warsaw and Kraków covering intelligence gathering and medical assistance.

Was nominated AK chaplain in captain rank.

Received original German documents where only the „profession” entry was falsified and stated „private office worker”.

Additionally with Pope Pius XII permission chaplain were allowed to say Holy Mass from memory, at any time of the day and night, without liturgical vestments, did not have to uphold Eucharistic fast, were permitted to bless marriages, grant a marriage dispensations, hear confessions and grant collective absolutions.

Among those undergoing preparations were Natalie Tułasiewicz, beatified by Holy Father St John Paul II, and Paul Krawczewicz.

In Germany arrived in 1943 or on c. 21.02.1944.

Last message from him that reach Polish territory is dated in 07.1944.

In German documents from the city of Nuremberg, there are entries mentioning a person named „Janiewski”, the forename quoted most often „Mieczysław” (also: „Mirosław”) and the same date and place of birth as the monk being described, and his place of residence in Warsaw at 62 Wilcza Str. The „White Book” assumes that it's the same person.

He had been registered in Nuremberg — as an „ironer/presser” — from 06.03.1944 to 02.01.1945.

Perhaps slaved in a „Chr.

Greyer” factory.

On 02.01.1945 was arrested by the German political police, the Gestapo, and placed in a local prison.

On 07.01.1945 (or on 09.04.1945) transported to the German KL Flossenbürg concentration camp.

Fate thereafter unknown.

The last date registered states 09.04.1945.

It is probable that perished in 04.1945, possibly on the aforementioned 09.04.1945 (that day in KL Flossenbürg, the Germans shot about 20 people, including those related to the assassination attempt on Hitler's life on 20.07.1944), or perhaps during the so‑called „Death march” to KL Dachau, which set off from KL Flossenbürg on April 20, 1945.

cause of death




date and place
of birth


Drohobychtoday: Drohobych urban hrom., Drohobych rai., Lviv, Ukraine
more on
[access: 2021.10.09]

religious vows

03.10.1927 (temporary)

presbyter (holy orders)


positions held

c. 1937 – 1943

friar {Krakówtoday: Kraków city pov., Lesser Poland voiv., Poland
more on
[access: 2021.06.07]
, Holy Trinity monastery, Dominicans OP}, i.a. monastery librarian (1939‑41)

biography (own resources)

Click to read biography details from our resourcesClick to read biography details from our resources

others related
in death

KRAWCZEWICZClick to display biography Paul

murder sites
(+ prisoner no)

KL Flossenbürg (prisoner no: 89762): German concentration camp, founded in 05.1938, where a total of approx. 96,000 prisoners were held captive. In 1942 it became the „mother camp” for many external commandos and sub‑camps whose prisoners worked as slaves for the needs of the German arms industry. On 09.04.1945 Germans executed in the camp several people related to 20.07.1944 assassination plot on Hitler, including Wilhelm Canaris, Hans Oster and Dietrich Bonhoeffer. On 20.04.1945, facing the approach of the Allied troops, about 22,000 prisoners were marched out in the so–called „Death March” to KL Dachau. Over 7,000 perished along the way. The camp was liberated on 23.04.1945 by American troops. In total, 30,000–77,000 prisoners died in the camp, including up to 17,000. Poles. (more on: en.wikipedia.orgClick to attempt to display webpage
[access: 2021.05.20]

Slave labour in Germany: During World War II Germans forced c. 15 million people to do a slave forced labour in Germany and in the territories occupied by Germany. In General Governorate the obligation to work included Poles from 14 to 60 years old. On the Polish territories occupied and incorporated into Germany proper obligation was forced upon children as young as 12 years old — for instance in Warthegau (Eng. Greater Poland). (more on: en.wikipedia.orgClick to attempt to display webpage
[access: 2017.11.07]

General Governorate: A separate administrative territorial region set up by the Germans in 1939 after defeat of Poland, which included German‑occupied part of Polish territory that was not directly incorporate into German state. Created as the result of the Molotov–Ribbentrop Pact, in a political sense, was to recreate the German idea of 1915 (after the defeat of the Russians in the Battle of Gorlice in 05.1915 during World War I) of establishing a Polish enclave within Germany (also called the General Governorate at that time). It was run by the Germans till 1945 and final Russian offensive, and was a part of so–called Big Germany — Grossdeutschland. Till 31.07.1940 formally known as Germ. Generalgouvernement für die besetzten polnischen Gebiete (Eng. General Governorate for occupied Polish territories) — later as simply niem. Generalgouvernement (Eng. General Governorate). From 07.1941 expanded to include district Galicia. (more on: en.wikipedia.orgClick to attempt to display webpage
[access: 2013.12.04]

Ribbentrop-Molotov: Genocidal Russian–German alliance pact between Russian leader Joseph Stalin and German leader Adolf Hitler signed on 23.08.1939 in Moscow by respective foreign ministers, Mr. Vyacheslav Molotov for Russia and Joachim von Ribbentrop for Germany. The pact sanctioned and was the direct cause of joint Russian and German invasion of Poland and the outbreak of the World War II in 09.1939. In a political sense, the pact was an attempt to restore the status quo ante before 1914, with one exception, namely the „commercial” exchange of the so–called „Kingdom of Poland”, which in 1914 was part of the Russian Empire, fore Eastern Galicia (today's western Ukraine), in 1914 belonging to the Austro–Hungarian Empire. Galicia, including Lviv, was to be taken over by the Russians, the „Kingdom of Poland” — under the name of the General Governorate — Germany. The resultant „war was one of the greatest calamities and dramas of humanity in history, for two atheistic and anti–Christian ideologies — national and international socialism — rejected God and His fifth Decalogue commandment: Thou shall not kill!” (Abp Stanislaus Gądecki, 01.09.2019). The decisions taken — backed up by the betrayal of the formal allies of Poland, France and Germany, which on 12.09.1939, at a joint conference in Abbeville, decided not to provide aid to attacked Poland and not to take military action against Germany (a clear breach of treaty obligations with Poland) — were on 28.09.1939 slightly altered and made more precise when a treaty on „German–Russian boundaries and friendship” was agreed by the same murderous signatories. One of its findings was establishment of spheres of influence in Central and Eastern Europe and in consequence IV partition of Poland. In one of its secret annexes agreed, that: „the Signatories will not tolerate on its respective territories any Polish propaganda that affects the territory of the other Side. On their respective territories they will suppress all such propaganda and inform each other of the measures taken to accomplish it”. The agreements resulted in a series of meeting between two genocidal organization representing both sides — German Gestapo and Russian NKVD when coordination of efforts to exterminate Polish intelligentsia and Polish leading classes (in Germany called Intelligenzaktion, in Russia took the form of Katyń massacres) where discussed. Resulted in deaths of hundreds of thousands of Polish intelligentsia, including thousands of priests presented here, and tens of millions of ordinary people,. The results of this Russian–German pact lasted till 1989 and are still in evidence even today. (more on: en.wikipedia.orgClick to attempt to display webpage
[access: 2015.09.30]

Pius XI's encyclicals: Facing the creation of two totalitarian systems in Europe, which seemed to compete with each other, though there were more similarities than contradictions between them, Pope Pius XI issued in 03.1937 (within 5 days) two encyclicals. In the „Mit brennender Sorge” (Eng. „With Burning Concern”) published on 14.03.1938, condemned the national socialism prevailing in Germany. The Pope wrote: „Whoever, following the old Germanic–pre–Christian beliefs, puts various impersonal fate in the place of a personal God, denies the wisdom of God and Providence [...], whoever exalts earthly values: race or nation, or state, or state system, representatives of state power or other fundamental values of human society, […] and makes them the highest standard of all values, including religious ones, and idolizes them, this one […] is far from true faith in God and from a worldview corresponding to such faith”. On 19.03.1937, published „Divini Redemptoris” (Eng. „Divine Redeemer”), in which criticized Russian communism, dialectical materialism and the class struggle theory. The Pope wrote: „Communism deprives man of freedom, and therefore the spiritual basis of all life norms. It deprives the human person of all his dignity and any moral support with which he could resist the onslaught of blind passions [...] This is the new gospel that Bolshevik and godless communism preaches as a message of salvation and redemption of humanity”... Pius XI demanded that the established human law be subjected to the natural law of God , recommended the implementation of the ideal of a Christian state and society, and called on Catholics to resist. Two years later, National Socialist Germany and Communist Russia came together and started World War II. (more on: www.vatican.vaClick to attempt to display webpage
[access: 2023.05.28]


www.straty.plClick to attempt to display webpage
[access: 2019.04.16]


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