This style of architecture emerged in India in the 19th century during the period of British rule. It combined the elements of Mughal architecture and modern. It’s known as the Indo-Saracenic style because the essential elements of Mughal architecture like arches, dome, and minarets emerged 1st time in Syria during the 3rd to 7th century (pre-Islamic Syria).
These architectural elements were adopted by Persians & Turks in Asia. This moves to Europe as well (European Gothic style). In Indo-Saracenic style of architecture, along with the use of arches, domes, minarets, volute roof, arcade (pillared corridor), spire (conical part over tower), turret (tower), Tracery (carving on stone) was used.
The monument of Indo-Saracenic styles was built by using advanced European civil engineering technology. Such as poured concrete, iron, and steel in construction. Indo-Saracenic style of architecture manifested itself primarily in the construction of the public buildings such as the railway station, legislative assembly hall, court building, museum & commemorative structure such as the gateway of India & India Gate. Chepauk palace (Chennai) designed by Paul Benefield is the cathedral to be 1st monument of India-Saracens style.