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Icelandic politician (1180–1247)
This is an Icelandic name. The last name is patronymic, not a family name; this person is referred to by the given name Halldóra.
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Tumadóttir's husband and four of her sons were killed in 1238 in the Battle of Örlygsstaðir. She and her surviving young son, Tumi, were compelled to move from the family's home, Grund, in Eyjafjörður to one where Kolbeinn ungi Arnórsson, Tumadóttir's nephew and her husband's killer, could monitor them.
Halldóra's daughter, Steinvör Sighvatsdóttir (c. 1205-1271) married Hálfdan, son of Sæmundr Jónsson, and was an active participant in politics during the Icelandic Commonwealth period. She was the legally designed heir of her brother, Þórður kakali Sighvatsson, who had no legitimate children.