Rayna Popgeorgieva Futekova (Bulgarian: ????? ???????????? ????????), better known as Rayna (aka Raika) Knyaginya (????? ???????), aka "Queen of the Bulgarians" (Panagyurishte, Ottoman Empire, 6 January 1856 OS – Sofia, Kingdom of Bulgaria, 29 July 1917) was a Bulgarian teacher and revolutionary born in Panagyurishte who is famous for having sewn the flag of the April Uprising of 1876.