Ivar "The Boneless" Ragnarsson
Ivar "The Boneless" was born about 0787 in ,,,Denmark.  He died in 0873.¹ 

 Halfdan Ivarsson
Halfdan was born about 0812.  Halfdan is no longer alive.

 Sigtryd Halfdansson King Of Dublin
Sigtryd was born in 0849.  He died at the age of 47 in 0896.

 Guthorm Ivarsson King of Dublin
He died in 0890.²