Bergenhus len was an administrative division of the Kingdom of Norway that existed from 1503 to 1662, with the Bergenhus Fortress in Bergen as its administrative center Norwegian administrative division. The len was changed to an amt (district) in 1662 but it kept its original name and capital until 1919.
Formerly, in Norway, the term len (plural len) represents an administrative region whose borders roughly match those of the counties of today. It was an essential part of the national administration during the years when the two kingdoms of Denmark and Norway were united as a single kingdom. At the beginning of the 16th century the political divisions were variable but, since 1503, there were four main slottslen (castle provinces), each with about 30 smaller sub-divisions. They were:
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In 1536, North Norway was added to the len of Bergenhus but the len still had about 30 sub-divisions. In 1560, they were:
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On 19 February 1662, by royal decree, all the len, including Bergenhus, were renamed as amt (plural amt), and their lenmann were recast as the amtmann, both from Amt, the German word for "office", reflecting the bias of the Danish court of that year.
In 1671, Norway was divided once more, this time into four principal amt or stiftsamt and nine subordinate amt. Bergenhus amt was the stiftsamt and its subordinate amt were Halsnøy klostergods, Hardanger amt and Nordlandene amt.
In 1763, Bergenhus was divided in two, creating the following amt – Nordre Bergenhus amt and Søndre Bergenhus amt.
In 1919, Nordre Bergenhus amt was renamed as Sogn og Fjordane fylke (county) and Søndre Bergenhus amt became Hordaland fylke, and each of their amtmann were retitled as a fylkesmann (country governor). In 2020, the counties of Hordaland and Sogn og Fjordane merged into the new Vestland county.
. Kavli, Guthorm . Guthorm Kavli. Norges festninger. Universitetsforlaget . 1987. 82-00-18430-7.