Älvsborg County (Swedish: Älvsborgs län) was a county of Sweden until 1997, when it was merged with the counties of Gothenburg & Bohus and Skaraborg to form Västra Götaland County. The county corresponded to the traditional province of Dalsland and the central part of the province of Västergötland, and its coat of arms was created by quartering the respective arms of those provinces. Älvsborg County initially encompassed the entire western half of Västergötland, and was named after Älvsborg Castle, which is where the county administration was initially based.
https://en.wikipedia.org/wiki/%C3%84lvsborg_County