It's worth searching the web for spellings like Hanlyn, also Hamlin and Hamlyn. Have you any idea in which county it is/was - or of the name of the nearest town?
Carrickfergus Castle is wrong its Ballynahinch Castle
Yes.
he is the conquror of Norway and king of englad
Yes, he actually grew up in a castle that his family owned.
Corfe Castle was owned by members of the Bankes family from 1635 to some time in the 1980s, a period of roughly 350 years.
Big houses in Ireland range from state owned and managed properties to private properties. Castle Town House and Emo Court are state owned and managed properties. They are the biggest of them. The biggest house of private properties is Beaulieu and Bantry.
Ireland is not "owned" by anyone, except its own citizens.
Kilkenny Castle was bought by the Butler family in Ireland in 1391 and they owned it until 1967. There is no direct connection between the actor Gerard Butler and Kilkenny Castle. His great-grandparents were Irish. He was born in Scotland.
Corfe Castle is now owned by the National Trust who were given it by the Bankes family (link below) who owned it having bought in 1635. The castle was owned by the Crown until Elizabeth 1 sold it in the 16th century
Ballynahinch Castle
Ireland is not owned by any country. It is independent. Northern Ireland, which may be what you are referring to, is part of the United Kingdom.
Cadw.
England and Ireland
Ballynahinch Castle
The king and the nobles.
Carrickfergus Castle is wrong its Ballynahinch Castle
Yes.