Temüjin was probably born in 1162 in Delüün Boldog, near Burkhan Khaldun mountain and the Onon and Kherlen rivers in modern-day northern Mongolia, not far from the current capital Ulaanbaatar. The Secret History of the Mongols reports that Temüjin was born with a blood clot grasped in his fist, a traditional sign that he was destined to become a great leader. He was the second-oldest son of his father Yesügei, a Khamag Mongol's major chief of the Kiyad and an ally of Toghrul Khan of the Keraite tribe, and the oldest son of his mother Hoelun. According to the Secret History, Temüjin was named after a Tatar chieftain, Temüjin-üge, whom his father had just captured.