Analysis of information sources in references of the Wikipedia article "Al-Mu'ayyad Shihab al-Din Ahmad" in English language version.
Uthman Inal Sultan.
...On his death on the 26th of February 1461 his son Aḥmad was proclaimed sultan with the title Malik al-Mu'ayyad; he had the usual fate of sultans' sons.....he was compelled to abdicate on the 28th of June 1461