The period is remarkable for its characteristic architecture which can still be observed in old Bulgarian towns such as Tryavna, Koprivshtitsa and Veliko Tarnovo, the rich literary heritage of authors like Ivan Vazov and Hristo Botev that inspired the Bulgarian struggle for independence and an autonomous church, and the April Uprising of 1876, a significant event of armed opposition to Ottoman rule, which ultimately led to the Russo-Turkish Liberation War of 1877-78.