The sipahi were traditionally recruited among Turkic landowners, and thus, the non-Turkic provinces such as Arabia and Maghreb did not have sipahi. Recruitment of non-Turkic sipahi was banned with a 1635 ferman (decree). In contrast to the Janissaries, Timarli Sipahis from that time onwards were Turks (Muslims). A rivalry between Jannisaries, who controlled the central bureaucracy of the empire and had a lot of political influence, and sipahis, who controlled the provincial bureaucracy and had the power of the army, prevented them from cooperating against the House of Osman.