Rayna Popgeorgieva Futekova, better known as Rayna Knyaginya (1856-1917) was a Bulgarian teacher and revolutionary born in Panagyurishte who is famous for having sewn the flag of the April Uprising of 1876.
The lion on the flag was drawn by Stoyan "Banenetsa" Karaleev after the pattern of the lion printed on the cover of the Bulgarian Revolutionary Central Committee's organization chart and the letters were drawn by Ivancho Zografa. Besides the Свобода или смърт (Svoboda ili smart, Freedom or death) inscription, the letters П and О (standing for Панагюрски окръг, the Panagyurishte revolutionary district) were added at the bottom.
On 22 April, the day of the flag's sanctification by priests from neighbouring villages, Rayna sewed tassels prepared during the night to it. The flag's size is 2 by 1.5 m, it has two sides and is hemmed by a strip of gold lace.
On the day the uprising was proclaimed, she waved the flag together with Georgi Benkovski. After it was brutally crushed by Ottoman troops, she was captured, beaten and allowed only to eat bread and water for more than a month in the Plovdiv prison.