Agios Nikolaos and Agia Triada are the only two orthodox churches of Ano Syros. Agios Nikolaos ton Ptohòn (or o Ftohòs, an epithet meaning the Poor), is the oldest church of the whole island and it had been built in mid 16th century.
It is worth noting that in Ermoupolis there is another orthodox church of Agios Nikolaos, but this one is given the epithet o Plousios (meaning the Rich), in contrast to the one located in Ano Syros.