Although parties were centered around the individual leaders, often bearing their names, two broad political tendencies existed: the liberals, led first by Charilaos Trikoupis and later by Eleftherios Venizelos, and the conservatives, led initially by Theodoros Deligiannis and later by Thrasivoulos Zaimis. Trikoupis and Deligiannis dominated Greek politics in the later 19th century, alternating in office. Trikoupis favoured co-operation with Great Britain in foreign affairs, the creation of infrastructure and an indigenous industry, raising protective tariffs and progressive social legislation, while the more populist Deligiannis depended on the promotion of Greek nationalism and the "Megali Idea".