Hvalsey ("Whale Island"; Greenlandic Qaqortukulooq) is located near Qaqortoq, Greenland and is the site of Greenland's largest, best-preserved Norse ruins in the area known as the Eastern Settlement (Eystribyggð).
According to the Icelandic Book of Settlements (Landnámabók), the farmstead was established by Erik the Red's uncle, Þorkell (Thorkell) Farserkur in the late 10th century.
The farmstead was known as Þjóðhildarstaðir (Thjódhildsstead) by the time of Ivar Bardarson's report of ca 1360/64. In the 14th century, it belonged to the Kings of Norway:
Næst Einarsfirði liggr Hvalseyjarfjörðr. Þar er kirkja, sem heitir Hvalseyjarfjarðarkirkja. Hún á allan fjörðinn ok svá allan Kambstaðafjörð, sem er næstr. Í þessum firði stendur bær mikill, sem konungi tilheyrir og heitir Þjóðhildarstaðir.
Beside Einar's Firth lies Hvalsey Fjord. There is a church there called Hvalsey Fjord Church. It serves the entire fjord and all of Kambstad Fjord as well, which is beside it. On this firth stands a large farmstead, which belongs to the king and is called Thjodhild's Stead.
The farmstead was a major center in South Greenland. The site, which has the ruins of two stone great halls, had an additional 14 houses close to a churchhouse. The old hall, which is 14 metres (46 ft) long and 3 metres (9.8 ft) or 4 metres (13 ft) wide, is in the middle of the ruins. The well-preserved newer hall measures 8 metres (26 ft) by 5 metres (16 ft).
The church house, which was first erected in the early 12th century, might have been built by Scots-Norse stonemasons as similar structures are found in Norway and Orkney. The church might have been maintained due to the site's royal ownership.
The church house was exceptionally well built from carefully chosen stones that in some cases weigh in excess of five tons. Its walls, which are up to 1.5 metres (4 ft 11 in) thick, measure 16 metres (52 ft) by 8 metres (26 ft) on the outside. The gables rise 5 metres (16 ft) to 6 metres (20 ft) from the floor and may have risen 2m higher when first constructed. Side walls, which would have been higher when new, now stand 4 metres (13 ft). The building was plastered with ground mussel shells and would have been white when in use and was roofed with timber and turf.