He became sultan for the third time in 1310 at the age of 24, and had a satisfying reign of three decades. Determined to chart his own course and eliminate hindrances, he had his predecessor al-Jashnakir executed, and replaced his earlier vice-sultan Salar with a new man, Baktmar al-Jukondar. (He arrested Salar a year later; Salar died in prison.)
Unfortunately, al-Jukondar was not a loyal vice-sultan, and conspired in 1310 to overthrow al-Nasir and replace him with al-Nasir's nephew, Emir Musa (Musa's father was as-Salih Ali, Al-Nasir's brother). Musa was up for the change, but someone spilled the beans and al-Nasir had al-Jukondar and Musa arrested.
Al-Nasir came more pro-active after that. Emirs who were corrupt or had opposed him in the past found their property taken by the sultan. He appointed a man with a reputation for being tough on corruption as the head Al-Nasir would have the Court of Justice. Al-Nasir would spend time each Monday allowing the common people to come to him with complaints against officials. He eliminated some additional taxes that had recently been put in place but really just enriched corrupt emirs. He prohibited executions without his permission. He also ordered a comprehensive land survey to re-set the property taxes owed.
He also got rid of the position of vice-sultan. (And built at least one mosque, pictured above.)
He was fortunates during his reign that recent losses weakened the Mongols, and there were no Crusades that invaded Egypt. This gave him years of relative peace from external enemies. In fact, he was the cause of external conflict for other territories. I'll talk about his attempts to expand his kingdom tomorrow.