sinn er siður í landi hverju

Icelandic

Etymology

From sinn (“its”) + er (“is”) the third person singular of vera (“to be”) + siður (“custom”) + í (“in”) + landi the dative of land (“land”) + hverju the neuter dative form of hver (“each”). Literally meaning "its [own] is the custom in each land", "customs are unique for every country" or "each country has its own customs".

Compare the Faroese phrase sær er siður á landi.

Phrase

sinn er siður í landi hverju

1. when in Rome, do as the Romans do