Events

• 16 April - After this date, John de Carew renovates and repaires Balymotha/Clerevoyse castle [1]

• "At this time the whole of the Irish of Leinster placed themselves at war against the English and the peaceful people, burning, plundering and killing whomsoever they were able, sparing neither churches nor sacred places nor vestments. On the contrary they plundered and burnt churches and cemeteries in various places, like the church of Duleek
  Duleek
  Duleek is a town in County Meath, Ireland, close to the Louth border.Duleek takes is name from the Irish word daimh liag, meaning house of stones and referring to an early stone-built church, St Cianan’s Church, the ruins of which are still visible in Duleek today...
  
   and Fennor and Cloghan et cetera." [2].

• 23-29 April - The castles of Lea, Kilmohide and Balylethan in Leinster
  Leinster
  Leinster is one of the Provinces of Ireland situated in the east of Ireland. It comprises the ancient Kingdoms of Mide, Osraige and Leinster. Following the Norman invasion of Ireland, the historic fifths of Leinster and Mide gradually merged, mainly due to the impact of the Pale, which straddled...
  
   captured by Uí Mhórdha, Uí Chonchobair (Ó Conchubhair Fáilghe) and Uí Dhíomusaigh [3].

• 4 May - The above castles "broken" by the above on this date [4].

• 5 May - "The one eyed Diarmaid Mac Giollaphádraig ... aided by the Uí Céarbhail ... burned the town of Aghaboe
  Aghaboe
  Aghaboe is a village and parish in County Laois, Ireland. It is located on the R434 regional road in the rural hinterland west of the town of Abbeyleix....
  
   and the cemetery and church and cruelly forsaking St. Canice, abbot, patron of the neighbourhood and found of the place, he, like a degenerate son to his father, burnt and completely destroyed with the crullest fire, the saint's shrine with his bones and relics." [5].

• June - Lord Walter de Bermingham, arrived in Ireland as its new Justiciar. [6].

• 24 June - "Around the Feast of the Baptist, four hundred of the men of Uriel and Dundalk
  Dundalk
  Dundalk is the county town of County Louth in Ireland. It is situated where the Castletown River flows into Dundalk Bay. The town is close to the border with Northern Ireland and equi-distant from Dublin and Belfast. The town's name, which was historically written as Dundalgan, has associations...
  
   were killed by the Irish." [7].

• 27 July - Roger de la Freigne, Sheriff of Kilkenny
  Kilkenny
  Kilkenny is a city and is the county town of the eponymous County Kilkenny in Ireland. It is situated on both banks of the River Nore in the province of Leinster, in the south-east of Ireland...
  
  , "seized a great prey over Cearbhall Mac Giollaphádraig and over his men such as had rearely been taken in those parts, remembered by men for many years." [8].

• 9 September - Thadhg mac Ruaidhrí Ó Céarbhaill, princeps of Ely O'Carrol, a powerful, wealthy, rich and warlike man, a particular persecutor and enemy of the English and faithful subjects, was killed by Lord Fulk de la Freigne. He (Ó Céarbhaill) killed, exiled and ejected from his lands of Ely O'Carroll those of the nation of de Barry, de Milleborne, de Brit and other English of the neighbourhood, and he took and occupied their lands and castles, being an oppressive tyrant to all faithful subjects nearby. On the same day Ruaidhrí, son of Ó Mórdha was captured by the same. Nicholas le Grasse was killed." [9].

• 23 November - "Around the Feast of St. Clement, thirty menn of the Dhíomusaigh were killed at Ardscull by two men, Thomas Wogan and Walter Lenfaunt." [10].

Unknown date

• Battle of Calry Lough Gill.

• "In that winter there was a war between the English, namely W[alter] de Bermingham, and the Earl of Kildare, and Uí Mhórdha and Uí Dhíomusaigh, and they attacked and burnt their lands; they killed few men however." [11].

Deaths

• 8 April - Maurice Fitz Phillip dies imprisoned at Dublin Castle
  Dublin Castle
  Dublin Castle off Dame Street, Dublin, Ireland, was until 1922 the fortified seat of British rule in Ireland, and is now a major Irish government complex. Most of it dates from the 18th century, though a castle has stood on the site since the days of King John, the first Lord of Ireland...
  
  . [12].
• 9 April - Ralph de Ufford, Justicier of Ireland, dies at Kilmainham
  Kilmainham
  Kilmainham is a suburb of Dublin south of the River Liffey and west of the city centre, in the Dublin 8 postal district.-History:In the Viking era, the monastery was home to the first Norse base in Ireland....
  
  . [13].
• 21 April - Diarmaid Ó Díomusaigh killed by Sir Robert Fitz Maurice. [14].
• June/July - Lord John fitz George de Roche "killed by the Ketyngs (Keatings) and the Hodintes." [15].
• Winter 1346 - Adam Northapton, Bishop of Ferns
  Bishop of Ferns
  The Bishop of Ferns is an episcopal title which takes its name after the village of Ferns in County Wexford, Ireland. In the Roman Catholic Church it remains a separate title, but in the Church of Ireland it has been united with other bishoprics.-History:...
  
  . [16].