In the fourth millennium BC, the first farmers arrived in Ireland. They buried their dead in large stone-built chambered tombs known as megalithic tombs. There are about 160 tombs in County Mayo.

The Céide Fields are the oldest known field systems in the world, over five and a half millennia old.

St. Patrick came to County Mayo, where he spent forty days and nights  fasting and praying on the summit of Croagh Patrick .In the 6th century hundreds of monastic settlements were established in Mayo.

In the 9th century when the Vikings invaded, monasteries in Mayo built round towers for protection. Many monasteries were destroyed.

After the Norman invasion in 1169, Mayo came under their control in 1235. In the 16th century Gráinne Ní Mháille, Grace O'Malley was lord of the Ó Máille dynasty. She was known as the "sea-Queen".

Charles C Boycott was an English land agent who became…