Stefan was the first born son, and second child of four, of Count Władysław Tyszkiewicz and his wife, Princess Krystyna Maria Lubomirska.

His older sister, Zofia Róża, was famed as a great beauty and married Count Klemens Potocki.

He met the step-daughter of Grand Duke Nikolay, who was herself related to several royal houses of Europe, Princess Elena of Leuchtenberg (1892–1971).

In 1921 as a delegate of the Chief-of-staff of the Polish Army, he took part in the League of Nations commission charged with defining the new Polish–Lithuanian frontier.

Following the birth of his daughter, Tyszkiewicz left for Paris to resume his academic studies interrupted seven years earlier at Oxford.

The aim was to construct an all terrain passenger carrier adapted to a very poor road infra-structure and easy to maintain and repair.

[5] It also met with success at Polish sporting and trial events and it participated in the 1929 Eighth Monte Carlo Rally when it won recognition and a prize for comfort and its adaptability for long-distance travel.

In support, his wife parted with her own family heirloom, an 86 carat emerald brooch, which had once belonged to Catherine the Great.

After the occupation of Lithuania by the Soviet Union in June 1940, Tyszkiewicz was arrested and taken to Moscow where he was invited to collaborate with the NKVD, an offer he rejected requesting instead a laissez-passer to Italy.

He was released from Lubianka Prison in October 1941 and made his way to the General Anders' army being formed then in preparation for a mass exodus from the USSR.

Having traversed into Iran, thence to Palestine and Egypt, as a Rotmistrz – captain – in the 1st Krechowce Uhlan Regiment and as Communications Officer, (or personal adjutant) to gen. Anders, in 1944 he was especially useful connecting with Italian units fighting on the Allied side.

[6] During the buildup to the Battle of Monte Cassino, he invented a mechanism for discovering and destroying non-magnetic anti-personnel mines.

In 1949, with Stanisław Mackiewicz he published a weekly entitled, Lwów i Wilno – 'Lviv and Vilnius', a campaigning publication following the Soviet annexation of these two ethnically diverse cities in the Second Polish Republic and the displacement of hundreds of thousands of their residents, some of whom had found refuge in Britain.

[7] His war time alliances drew him to the Poles settled in the UK, but his wife preferred to live in Rome where he visited often.

[1] http://www.tygodnik.lt/200951/bliska5.htm[permanent dead link‍] Narkowicz Liliana 'Uchodźca i bezpaństwowiec', access 2012-04-14, review: Tygodnik Wileńszczyzny vol.