Languages of Sweden
The Language Law of 2009 recognizes Swedish as the "main" and "common" language of society as well as being the official language in "international contexts".
Old Swedish
Old Swedish (Modern Swedish: "fornsvenska") is the name for two distinct stages of the Swedish language that were spoken in the Middle Ages: Early Old Swedish ("Klassisk fornsvenska"), spoken from around 1225 until 1375, and Late Old Swedish ("Yngre fornsvenska"), spoken from 1375 until 1526.