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?
Yes.
Carrickfergus Castle is wrong its Ballynahinch Castle
he is the conquror of Norway and king of englad
Cainhoe Castle, located in Bedfordshire, England, was owned by the de Beauchamp family in the 11th century. The castle was originally built by the Anglo-Saxon lord, and after the Norman Conquest, it came into the hands of the de Beauchamps, who were significant landholders in the region. The de Beauchamps played a vital role in the feudal system of the time, contributing to the castle's historical significance.
Yes, he actually grew up in a castle that his family owned.
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
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.
Ballynahinch Castle
The castle formerly owned by the Guinness family is Ashford Castle, located in County Mayo, Ireland. Built in the 13th century, it was transformed into a luxury hotel and is renowned for its stunning architecture and beautiful grounds. The Guinness family acquired it in the 1930s, and it remained in their possession until it was sold in the late 20th century. Today, Ashford Castle is a popular destination for travelers seeking a taste of Irish history and elegance.
Cadw.
England and Ireland
Ballynahinch Castle
Yes.
The king and the nobles.