Sultan Sulaiman Royal Mosque () is Selangor's royal mosque, which is located in Klang, Selangor, Malaysia. It was constructed by the British in the early 1932 and was officially opened in 1933 by the late Almarhum Sultan Sir Alaeddin Sulaiman Shah. This mosque combines various types of architectural styles (such as Moorish and Art Deco) and interior and exterior designs not replicated in other mosques around the country. Sultan Sulaiman Mosque was the main state mosque of Selangor until the opening of Sultan Salahuddin Abdul Aziz Mosque in the new capital city of Shah Alam. Some of its interesting features include the Tangga Diraja (royal stairs) from Istana Alam Shah and a royal mausoleum. The late Sultan Salahuddin was buried in the mosque's grounds. Architecture The design concept of the Sultan Sulaiman Mosque is quite different from other mosques in the state, as well as in the rest of Malaysia's as it notably exhibits a combination of influences of Islamic architecture, Moorish, English, Neoclassical cathedral, and most importantly, Western Art Deco styles. It was designed by the British architect Leofric Kesteven (1882-1974), who was the Chairman of the Malayan Institute of Architects from 1931 to 1933, along with John Thomas Chester, the reinforced concrete specialist attached to United Engineers Ltd; and Rodolfo Nolli, the Singapore-based Italian sculptor who worked on the ornaments of the building. The semicircular-shaped dome of the mosque is painted in egg yellow, not gold. The large dome of the main prayer space is surrounded by four smaller domes. The main dome represents the Sultan of Selangor while the smaller domes refer to Dato' Besar Empat Suku Selangor. Five domes at the main entrance of the mosque symbolise the Five Pillars of Islam and five Daeng Brothers, while two umbrella-shaped domes are symbolic of the royal umbrella. There are eight smaller towers around the mosque and a large tower in the middle, with a higher entrance from the main porch. The tower is also decorated with yellow dome at the summit. The original design of the mosque was like a cross bar when viewed from above, as is so often used in church plans in Europe, but after renovations by the Selangor Islamic Religious Department (JAIS), the mosque now has a square footprint. The present mosque has been through a number of processes and internal modifications; the most recent restoration was completed in 2017, which restored 70