The Risbyle Runestones are runestones found near the western shore of Lake Vallentunasjön in Uppland, Sweden. They were engraved in Old Norse with the Younger Futhark in the early 11th century by the Viking Ulf of Borresta (Báristaðir) who had partaken three times in the danegeld in England and raised the runestone U 336 in the same region. The were raised in memory of Ulf of Borresta's kinsman-by-marriage Ulf in Skolhamarr (Skålhammar).
One of the runestones has the Eastern cross which shows the influence of Byzantine culture on Sweden at this time through the Varangians who returned after having served the Emperor in Constantinople (see also the Greece Runestones and the Italy Runestones). The cross is today the coat-of-arms of Täby Municipality. Both runestones are in the style Pr1, and they have a pronounced Ringerike character.
The Skålhamra clan who asked Ulf of Borresta to make the runestones also had another couple of runestones made at Arkils tingstad across the lake, in addition to the runestone U 100 at a path in the forest.
This runestone was raised after Ulfr of Skolhamarr by his children Ulfke(ti)ll, Gýi and Un(n)i. The runemaster is considered to be Ulfr of Báristaðir himself.
This runestone was made by Ulfr of Báristaðir in memory of Ulfr in Skolhamarr, his kinsman-by-marriage, on the request of the latter Ulf's son Ulfke(ti)ll.