There are 'Gods on every street corner'. The street corner Gods have a fairly local jurisdiction, drawing worshippers only from the nearby houses. Then there are temples like the one in this picture; neither deity in this Ayyappan - Guruvayoorappan temple at Mahalingapuram is 'original', but represent the major Gods of the neighbouring state of Kerala - Ayyappan and Guruvayoorappan. As the capital of the Presidency, Madras was a magnet for people from regions that are in Kerala or in Andhra Pradesh today. The people stayed on and contributed their native architectural styles to the city's landscape.
In Chennai alone, Ayyappan has at least four large temples dedicated to him, while Guruvayoorappan has at least two. That's certainly a lot of devotees!