Archduke Johann Salvator of Austria (German: Johann Salvator, Italian: Giovanni Salvatore; 25 November 1852 – declared dead in absentia 2 February 1911) was a member of the Tuscan branch of the House of Habsburg-Lorraine. He was Archduke and Prince of Austria, Prince of Hungary, Bohemia and Tuscany. After renouncing those titles, he was known as Johann (John) Orth. He disappeared while sailing with his wife in July 1890 and is believed to have died when his ship encountered a storm near Cape Horn. Salvator was declared dead in absentia in February 1911.

Johann Salvator was born in Florence, the youngest son of Leopold II, Grand Duke of Tuscany and his second wife, Princess Maria Antonia of the Two Sicilies. He was baptized in Florence's Battistero di San Giovanni as Giovanni Nepomuceno Maria Annunziata Giuseppe Giovanni Batista Ferdinando Baldassare Luigi Gonzaga Pietro Alessandrino Zanobi Antonino. He pursued a career in the Austrian Army and was a good friend of Rudolf, Crown Prince of Austria, with both sharing liberal opinions.

After Bulgaria was granted autonomy by the Ottoman Empire, Johann Salvator was an unsuccessful candidate for the throne.Prince Alexander of Battenberg would be elected Prince of Bulgaria in 1879. During the Austro-Hungarian occupation of the Ottoman territory of Bosnia and Herzegovina in 1878, he was put in command of a division of the occupying army and won numerous honours.

...
Wikipedia