Árpád was the leader of the Magyar (Hungarian) people, who lead them in 895 from the their former homeland in southern Russia, bordering the Sea of Azov and the Don River, to the land which is now Hungary in the Carpathian Basin.
Árpád was the son of Álmos, a chieftain of one of several tribes of the Magyars, who traced his lineage to Attila the Hun (which may or may not be true). Árpád died in 907 A.D.
The Árpád dynasty refers to the descendants of this leader, and include King Saint Stephen the Great (István I in Hungarian, reigned 997-1038), and King Saint Ladislas (László I in Hungarian, reigned 1077-95). The dynasty lasted from 907 to the reign of Andrew III, ending in 1301.