The Silverkeep was founded by the Mountain Elves of the Ever-Reaching Highlands, who inhabited this world far before humans did. There is no exact date mentioned in any of the Elven scriptures from the time it was founded. Most of the knowledge of how long ago it was founded is seen from the elves' perspective that lived from that time to now.
History of Silverkeep
The history of the city of Silverkeep
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345 BHC
Founding of the City of Silverkeep
Founding