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* '''1210'''
* '''1211''', probably offshore and known to have produced large quantities of [[pumice]].<ref name="Austin Abbott Davies Pearce 2014 p. 135 " /> According to the ''[[Konungsannáll]]'', this was accompanied by an earthquake in which fourteen men perished and "fire came up from the sea", likely in August or September 1211.<ref name="McCreesh 2019 p. 35">{{cite book | last=McCreesh | first=B. | title=The Weather in the Icelandic Sagas: The Enemy Without | publisher=Cambridge Scholars Publishing | year=2019 | isbn=978-1-5275-2559-7 | url=https://books.google.co.uk/books?id=izWEDwAAQBAJ | access-date=2024-02-08 | page=35}}</ref> The Vatnsfell tuff cones northwest of Valahnúkamöl were likely created in this eruption, which would have taken place explosively underwater.<ref name="Thordarson Höskuldsson 2014">{{cite book | last=Thordarson | first=T. | last2=Höskuldsson | first2=Á. | title=Iceland | publisher=Dunedin Academic Press | series=Classic Geology in Europe | year=2014 | isbn=978-1-78046-511-1 | url=https://books.google.co.uk/books?id=KV1wDwAAQBAJ | access-date=2024-02-09}}</ref>
* '''1223'''
* '''1226''', recorded in the ''[[Íslendinga saga]]'' as a "sand-winter [which] was a very hard winter for the livestock";<ref>McCreesh, p. 15</ref> this appears to record a large fall of tephra resulting from an explosive eruption which probably took place several kilometres offshore.<ref name="Austin Abbott Davies Pearce 2014 p. 135 " /> The tephra fell over a wide area of the peninsula, as far away as [[Reykjavik]], and is known as the ''Miðaldarlagið'' or Middle Ages Tephra. Its source is unknown but may have been the volcanic islet of [[Eldey]], which is believed to have erupted during the Reykjanes Fires.<ref name="Thordarson Höskuldsson 2014" />
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