Ismail Mirza was born on the night of Thursday 31 May 1537 in Qom as the second son of Tahmasp I with his principal consort, Sultanum Begum.
Ismail Mirza's birth is described as occurring on a specific date (May 31st, 1537) and location (Qom), making him the second son of Tahmasp I and his wife Sultanum Begum.