The Destruction of the Idol al-Lat:

On this day, the 23rd of Ramadan in the year 9 AH, corresponding to 631 CE, the idol al-Lat was destroyed, following the conquest of Mecca and the demolition of all idols around the Kaaba. The Prophet Muhammad (peace be upon him) sent an army led by the Sword of Allah, Khalid ibn al-Walid, to smash the idol al-Uzza, which was venerated by the Quraysh; he broke and destroyed it, and he also sent another expedition to demolish the idol Manat.

The Fall of the Sassanian Empire:

On this day, 23rd of Ramadan in the year 31 AH, corresponding to 653 AD, the Sassanian Empire collapsed, and the Persian state surrendered to the Muslims. The Islamic conquests of Persia began in 12 AH, corresponding to 632 AD, the same year that Yazdegerd III, the grandson of King Khosrow I, ascended to the Sassanian throne. In that same year, the initial Arab Islamic conquests of Persia began. Sa'd ibn Abi Waqqas defeated the large Sassanian army led by General Rustam Farrokhzad in the Battle of Qadisiyyah in the year 637 AD, and the city of Al-Madain was besieged and fell after the siege.