Halldóra Þorvaldsdóttir donates the lands of Hólar, Garður and Þæfustein to the monastery at Helgafell, year 1364

Source:

Diplomatarium Islandicum: Íslenzkt Fornbréfasafn, Volume 3, page 201, published by S. L. Möllers, Copenhagen, 1896

https://archive.org/details/diplomatariumisl03kaupuoft/page/200/mode/2up

The letter:

Holar. Gardar og þæfusteinn.
Halldora þorualldzdotter gieffur klaustrinu a Helgafelle med sier j profentu þessar þriar jarder Hola. Garda og þæffustein. huoriar allar liggia j krijngum Jôkul. þa Rijkte Asgrijmur abote. Datum skriffadest 1364.