Giovanni Antonio Colonna di Cesarò

Don Giovanni Antonio Colonna Romano, Duke of Cesarò and of Reitano (22 January 1878 – 7 November 1940) was an Italian noble and politician who was the leader of the Social Democracy. He also served as the minister of post and telegraphs between 1922 and 1924 in the Mussolini Cabinet. He was known as the "anthroposophist duke". From 1907, he started his political career and became a member of the parliament in the period 1909–1921. He founded and published a magazine entitled Rassegna contemporanea which is among the early anthroposophical publications.

Following the general elections on 15 May 1921 Colonna was named as the minister of post and telegraphs in the cabinet led by Giovanni Giolitti. In 1922, Colonna established the Social Democracy party and joined the government of Benito Mussolini as the minister of post and telegraphs, which he held until his resignation in February 1924. Following this incident, Colonna retired from politics.

Close to the environments of esotericism and Roman neopaganism of those years, Colonna was part of the UR Group which was established in 1927 (perhaps with the pseudonym of "Arvo", or with those of "Krur" and "Breno").

He died in 1940.

Colonna was married to Barbara Antonelli, a noblewoman of Russian origins, and their daughters were Mita and Simonetta Colonna di Cesarò.