Mount Entoto, a high tableland to the north of current Addis Ababa, is one of a handful of sites put forward as a possible location for a medieval imperial capital known as Barara. This permanent fortified city was established during the early-to-mid 15th century, and it served as the main residence of several successive emperors up to the early 16th-century reign of Lebna Dengel. The city was depicted standing between Mounts Zikwala and Menegasha on a map drawn by the Italian cartographer Fra Mauro in around 1450, and it was razed and plundered by Ahmed Gragn while the imperial army was trapped on the south of the Awash River in 1529, an event witnessed and documented two years later by the Yemeni writer Arab-Faqih. The suggestion that Barara was located on Mount Entoto is supported by the very recent discovery of a large medieval town overlooking Addis Ababa located between rock-hewn Washa Mikael and the more modern church of Entoto Maryam, founded in the late 19th century. Dubbed the Pentagon, the 30-hectare site incorporates a castle with 12 towers, along with 520 meters of stone walls measuring up to 5-meter high.