Further to what Rhiannon says below, Ulric was the commander-in-chief of a band of Viking raiders under Olaf Tryggvenson who were defeated by the Scots in a battle here in 968 CE. Legend has it Olaf is buried nearby under Dun Aula at Barbreck House, futher down Gleann Domhain.
Just to say - Dunan Aula (and its cist) are not down by the house but in the same field - the mound to the north west.