オットー・フォン・ハプスブルク
The oldest European unification movement is the Paneuropean Union, founded in 1923 with the publishment of Richard von Coudenhove-Kalergi's book "Paneuropa", who also became its first president (1926–1972), followed by Otto von Habsburg (1973–2004) and Alain Terrenoire (from 2004).