Franz Josef had been recognised heir to Liechtenstein since Wenzel's only son had died in 1723 and Wenzel took Franz Josef under his wing and Franz Josef accompanied him in a campaign in Northern Italy and fought with Wenzel at the Battle of Piacenza, a victory for the Holy Roman Empire of which Liechtenstein was a part. In 1763, Franz Josef traveled on behalf of the Emperor to Spain, in order to bring the bride of Archduke Leopold a picture of Archduke. In 1767, he became Privy Councillor, and in 1771, he received the Order of the Golden Fleece.
Once Franz Josef became Prince of Liechtenstein he showed great interest in economic problems and the ever increasing Liechtenstein art collection.
Prince FranzJosef was born at Frauenthal Castle in Styria on 16 August 1906.
In 1929 Prince FranzJosef graduated from the University as a forestry engineer and then devoted his attention to the administration of the vast estates in Czechoslovakia, which became his responsibility after the death of Prince Johannes II.
Liechtenstein experienced a second grand event when the Prince married Countess Georgine of Wilczeck (daughter of count Ferdinand of Wilczeck and countess Nora Kinski, born in Graz on 24 October 1921, died in Vaduz on 24 October 1989) on 7 March 1943.