Who was the first Ottoman sultan?

Osman Gazi: The First Ottoman Sultan

Osman Gazi, who ruled from 1299 to 1324, is the individual credited as the first sultan of the Ottoman Empire. He is referred to as "Ottomano" in Italian, which is the origin of the term "Ottoman" in English. A prominent Turkish tribal chieftain, Osman was pivotal in establishing the Ottoman dynasty. His efforts in both military conquests and diplomatic strategies enabled him to consolidate various territories, both those he inherited and those he seized, under his leadership.