Mashhad Imam Yahya ibn al-Qasim, was built in 1239 by Badr al-Din Lu'lu', the ruler of Mosul who supported the Shi'i belief. The Mausoleum is located on the Tigris riverbank, in the vicinity of the citadel. It was built with baked bricks and has a square plan, topped by a pyramidal roof raised on an octagonal drum, with an inner muquarnas dome.
The tomb is entered from the north. The east façade is covered by two heavy buttresses that prevent the structure from falling into the Tigris River. The main entrance is topped by a tall arch and flanked by two decorative niches. These niches contain turquoise bricks forming interlocking stars and octagons, and have kufic inscriptive panels below the crowning arch. There are similar niches on the west and south facades, placed on either side of a window.
The interior walls are richly decorated with several brick geometric panels. A marble band, carved with flowers and leaves in high relief, wraps around the interior walls at eye level, with a ceramic inscription band on top. This elaborate carving contrasts with the flat terracotta panels located on the plain brick walls above. There is another inscriptive band below the dome muqarnas, which is derived from cross-shaped plan. The mihrab is situated at the southwest corner of the tomb because the building is not oriented towards Mecca.
The shrine has been reported destroyed as of July 2014.
Bosworth, Clifford Edmond. The New Islamic Dynasties, 190-191. New York: Columbia University Press, 1996.