were kings of Denmark
in the 10th century
according to Sweyn II of Denmark
and Adam of Bremen
. They were the sons of the Swedish chieftain Olof (or Olaf) the Brash
who had conquered Denmark and they ruled together according to Swedish tradition.
Gnupa is mentioned on the two Sigtrygg Runestones raised by his wife Asfrid for their son Sigtrygg.