 Óláfr is known to have been survived by three children ; Haraldr ( d . 1248 ) , Rögnvaldr ( d . 1249 ) , and Magnús ( d . 1265 ) — all of whom ruled as kings in their own right . Although the mother of Óláfr 's children is not known for certain , she is thought to have been Christina . The Chronicle of Mann states that Óláfr 's immediate successor , Haraldr , was only fourteen years old at the time of his father 's death , which dates his birth to about the time of the marriage of Óláfr and Christina . 
