Lake Sevan is one of the largest high-mountainous freshwater lakes in the world. In the northwest part of Sevan Lake, on a narrow rocky peninsula, there stands one of the most prominent examples of medieval Armenian architecture – Sevanavank Monastery. It was founded in 874 AD by princess Mariam. The remnants of the monastery that was constructed in the 9th century include only two temples – Surb Arakelots and Surb Astvatsatsin, standing among numerous khachkars. The church buildings were constructed from black tuff, which probably gave the monastery its name Sevanavank - “the Black Monastery”.