1721 attack of the Safavid by rebelling Sunni Lezgins
Source (Wikipedia): Sack of Shamakhi

The sack of Shamakhi took place on 18 August 1721, when rebellious Sunni Lezgins, within the declining Safavid Empire, attacked the capital of Shirvan province, Shamakhi. The initially successful counter-campaign was abandoned by the central government at a critical moment and with the threat then left unchecked, Shamakhi was taken by 15,000 Lezgin tribesmen, its Shia population massacred, and the city ransacked.