This mosque was once a mosque of the Sultanate of Deli in jayanya, then from this mosque is often called Deli Mosque.
Meaning of the word Al Mashun is maintained, so the term is still in the guard and in keep.
Masjid Raya Al mashun is located on Sisingmangaraja street, around 200 M From Maimun Palace which is the Palace of Deli Sultanate, Masjid Al Mashun was built and started in 1906 and completed in 1909, the mosque was built and occupied by Sultan Maamun Al- Rasyid Perkasa Alamsjah and worth 1 (one) million Golden Dutch.
So it is not wrong if you go to the city of medan, occasionally stop by the place of Islamic worship.