Stockholms nation is a student society and one of thirteen nations at Uppsala University. The nation has its origins in the mid-17th century and regards 1649 as its official date of foundation, although this is uncertain. A document in the archives mentions students enrolled in the nation in 1649, but this is a copy of an original that was lost in a fire in 1702, and the nation is mentioned in the protocols of the consistory (board) of the university from 1656 as having been in existence for three years, which would put the foundation date at about 1653.
https://en.wikipedia.org/wiki/Stockholms_nation