Kingsgrave is a castle in Dorne, the region controlled by House Martell of Sunspear. The castle is located in the north-west of Dorne near the border with the Stormlands. It is east of the Prince's Pass and west of the Kingsroad, located deep within the Red Mountains.
In the books
In the A Song of Ice and Fire novels Kingsgrave is the seat of House Manwoody, a loyal vassal house of the Martells.
- Kingsgrave at A Wiki of Ice and Fire (spoilers from the books)