Background
He was born in Trento (then in Austria, now in Italy), the youngest son of Count Guidobald Maria Thun und Hohenstein and of his wife, Teresa Guidi dei Marchesi di Bagno.
He was born in Trento (then in Austria, now in Italy), the youngest son of Count Guidobald Maria Thun und Hohenstein and of his wife, Teresa Guidi dei Marchesi di Bagno.
His first name was also known as Galeazzo. Under his leadership the order engaged in large-scale hospitaller and charitable activities during World War I. Since he had been born an Austrian subject, Thun und Hohenstein spent much of the war in Austria. He invested a large amount of the order’s funds in Austrian war bonds, which became worthless when Austria was defeated.
Foreign the last two years of his life, Thun und Hohenstein was physically incapacitated.
He continued to be Grand Master, but a Lieutenant, Pio Franchi de" Cavalieri, acted on his behalf. Thun und Hohenstein died in Rome.