Gurguit Barbtruc was a legendary king of the Britons  as accounted by Geoffrey of Monmouth

Geoffrey of Monmouth

Geoffrey of Monmouth was a cleric and one of the major figures in the development of British historiography and the popularity of tales of King Arthur...

. He was the son of Belinus

Belinus

Belinus the Great was a legendary king of the Britons, as recounted by Geoffrey of Monmouth. He was the son of Dunvallo Molmutius and brother of Brennius. He was probably named after the ancient god Belenus.- Earning the crown :...

 and was said to have found a home for the Irish people

Irish people

The Irish people are an ethnic group who originate in Ireland, an island in northwestern Europe. Ireland has been populated for around 9,000 years , with the Irish people's earliest ancestors recorded having legends of being descended from groups such as the Nemedians, Fomorians, Fir Bolg, Tuatha...

.

Gurguit was a peaceful king who followed in the manner of his father and grandfather. Yet, when the king of the Danes refused to pay tribute to Belinus's son, Gurguit took a fleet and invaded Denmark

Denmark

Denmark is a Scandinavian country in Northern Europe. The countries of Denmark and Greenland, as well as the Faroe Islands, constitute the Kingdom of Denmark . It is the southernmost of the Nordic countries, southwest of Sweden and south of Norway, and bordered to the south by Germany. Denmark...

, killing the king and reducing the country to subservience.

On the return voyage, Gurguit came across a fleet of thirty ships of men and women, called Basclenses (Irish

Irish language

Irish , also known as Irish Gaelic, is a Goidelic language of the Indo-European language family, originating in Ireland and historically spoken by the Irish people. Irish is now spoken as a first language by a minority of Irish people, as well as being a second language of a larger proportion of...

), under the leadership of Partholoim. They had been exiled from Spain

Spain

Spain , officially the Kingdom of Spain languages]] under the European Charter for Regional or Minority Languages. In each of these, Spain's official name is as follows:;;;;;;), is a country and member state of the European Union located in southwestern Europe on the Iberian Peninsula...

 and sought a new land to live in. Gurguit did not allow them to settle in Britain

Great Britain

Great Britain or Britain is an island situated to the northwest of Continental Europe. It is the ninth largest island in the world, and the largest European island, as well as the largest of the British Isles...

 but he gave them the isle of Ireland

Ireland

Ireland is an island to the northwest of continental Europe. It is the third-largest island in Europe and the twentieth-largest island on Earth...

 to settle, which was uninhabited until then.

Gurguit died peacefully and was buried in the Caerleon

Caerleon

Caerleon is a suburban village and community, situated on the River Usk in the northern outskirts of the city of Newport, South Wales. Caerleon is a site of archaeological importance, being the site of a notable Roman legionary fortress, Isca Augusta, and an Iron Age hill fort...

, a city he built up from the time his father founded it. Guithelin

Guithelin

Guithelin was a legendary king of the Britons as accounted by Geoffrey of Monmouth. He became king after the death of Gurguit Barbtruc.He ruled liberally and temperately for his life. His Queen consort was an artisan and noblewoman named Marcia. When he died, his wife took over the government...

 succeeded him to the kingship.