Please answer the following question: Information:  - Powys Fadog was the northern portion of the former princely realm of Powys, which split in two following the death of Madog ap Maredudd in 1160. The realm was divided under Welsh law, with Madog's nephew Owain Cyfeiliog inheriting the south (see Powys Wenwynwyn) and his son Gruffydd Maelor I, who inherited the north.  - Wales is a country that is part of the United Kingdom and the island of Great Britain. It is bordered by England to the east, the Irish Sea to the north and west, and the Bristol Channel to the south. It had a population in 2011 of 3,063,456 and has a total area of . Wales has over of coastline and is largely mountainous, with its higher peaks in the north and central areas, including Snowdon, its highest summit. The country lies within the north temperate zone and has a changeable, maritime climate.  - Madog ap Maredudd (died 1160) was the last Prince of the entire Kingdom of Powys, Wales and for a time held the Fitzalan Lordship of Oswestry.  - Owain ap Gruffydd (c. 11301197) was a prince of the southern part of Powys and a poet. He is usually known as Owain Cyfeiliog to distinguish him from other rulers named Owain, particularly his contemporary, Owain ap Gruffydd of Gwynedd, who is known as Owain Gwynedd.  - The Irish Sea (, , , Ulster-Scots: "Airish Sea"), separates the islands of Ireland and Great Britain. It is connected to the Celtic Sea in the south by St George's Channel, and to the Inner Seas off the West Coast of Scotland in the north by the North Channel. Anglesey is the largest island within the Irish Sea, followed by the Isle of Man. The sea is occasionally, but rarely, referred to as the Manx Sea.  - Madog ap Gruffudd or Madog ap Gruffudd Maelor , was Prince of Powys Fadog 1191 - 1236 in north - east Wales .  - Welsh law is the primary and secondary legislation generated by the National Assembly for Wales, according to devolved authority granted in the Government of Wales Act 2006. Each piece of Welsh legislation is known as an Act of the Assembly. The first Assembly legislation to be officially proposed was called the NHS Redress (Wales) Measure 2008. These powers have been effective since May 2007. It is the first time in almost 500 years that Wales has had its own laws, since "Cyfraith Hywel", a version of Celtic law, was abolished and replaced by English law through the Laws in Wales Acts, passed between 1535 and 1542 by King Henry VIII.  - Powys Wenwynwyn or Powys Cyfeiliog was a Welsh kingdom which existed during the high middle ages. The realm was the southern portion of the former princely state of Powys which split following the death of Madog ap Maredudd of Powys in 1160: the northern portion (Maelor) went to Gruffydd Maelor and eventually became known as Powys Fadog; while the southern portion (Cyfeiliog) going to Owain Cyfeiliog and becoming known, eventually, as Powys Wenwynwyn after Prince Gwenwynwyn ab Owain, its second ruler.    Given the information above, choose from the list below the object entity that exhibits the relation 'father' with the subject 'madog ap gruffydd maelor'.  Choices: - george  - gruffydd maelor i  - henry viii  - madog ap maredudd  - owain gwynedd
A:
gruffydd maelor i