A popular form to create a new family name is the false patronymic, using the prefix "ben" or "bar" followed by words who are not the name of a parent. Examples include patriotic themes, such as ben Ami ("son of my people"), or ben Artzi ("son of my country"), and terms related to the Israeli landscape, such as bar Ilan ("son of the trees", also similar phonetically to the bearer's original family name Berlin). Another famous person who used a false patronymic is the first Israeli Prime Minister, David Ben-Gurion. His former family name was Grün, and he adopted the name "Ben-Gurion" ("son of Gurion"), not "Ben-Avigdor" (his father's name). Gurion was a Jewish leader in the period of the First Jewish–Roman War.