Hereditary lords · Kingdom of Connacht · as at first light, 1 January 1200

Moylurg

The plain of Boyle and Lough Key in north Roscommon, the Mac Diarmata kingdom, with the island fortress on Lough Key and the Cistercian abbey of Boyle.

Who he is

Name
Tommaltach na Cairrge Mac Diarmata (medium-low confidence)
Title
King of Moylurg (Mag Luirg)
Since
1197, after Conchobar Mac Diarmata died a monk at Boyle (not checked against the annals)
Born
Not pinned
Family
The Clann Mhaoil Ruanaidh, cousins of the Ua Conchobair
Confidence
low

Tommaltach 'of the Rock' (Carraig Locha Ce) died in 1207 in the usual account. The king of Moylurg is among the hostages John takes in 1210.

Overlord

The king of Connacht

What it holds

  • Mag Luirg round Boyle and Lough Key
  • Carraig Locha Ce, the Rock of Lough Key

How it was acquired

Dynastic right.

Allies and rivals

The Mac Diarmata are the chief vassals and kingmakers of the Ua Conchobair; Cathal Carrach killed Conchobar Ua Diarmata in 1189 as his father's murderer.

How things stand that morning

Held under Crobderg; it will be laid waste in 1201 by Crobderg's northern allies.

Wealth

The Boyle plain.

Military

The Rock of Lough Key.

Threats

  • The Carrach party

Places of note

  • Boyle Abbey: Cistercian abbey

Where the sources disagree

Evidence: Kings' names from memory of the annals, not checked.

On the map: Approximate.

Primary sources for Connacht

Chronicles, registers, sagas and inscriptions written in or near 1200 that cover this entry. Each has its own page with editions, translations and where to read it.

  • Annals of Clonmacnoise, Anonymous; English translation of a lost Irish chronicle by Conall Mac Geoghegan (medieval original lost; translated 1627). A midland chronicle, tied to Clonmacnoise and the kings of Meath and Connacht, surviving only in a 1627 translation. Read online
  • Annals of Loch Ce, Various (compiled for the Mac Diarmada of Moylurg) (compiled 1580s from older annals; the medieval section rests on a Connacht chronicle). The fullest Connacht account of the year: Cathal Carrach's seizure of the kingship, Cathal Crobderg's flight north, the Connacht expedition of de Courcy and the Ui Neill on Crobderg's behalf and its defeat, William de Burgh's role, and the devastation of the province's churches, with the names of the Connacht nobles and clergy who died. Read online
  • Annals of the Kingdom of Ireland by the Four Masters, Various; compiled by Micheal O Cleirigh and others (1632 to 1636, from medieval annals now partly lost). A seventeenth century compilation but it draws on lost medieval annals, so its 1200 entries add names and incidents missing elsewhere: the Connacht war and the English of Meath and Munster, the deaths of Irish kings and churchmen across the island, and raids in Thomond and Desmond. Read online
  • Annals of Ulster, Various; compiled by Cathal Mac Maghnusa (compiled about 1498 from much older annals; the entries for 1200 derive from contemporary record). The most reliable Irish annal for the north. Read online
  • The Topography of Ireland; The Conquest of Ireland, Gerald of Wales (Giraldus Cambrensis) (Topographia 1187 to 1188; Expugnatio 1189, revised later). The Conquest ends in 1185 and the Topography describes the island as Gerald saw it in 1183 to 1185, so neither covers 1200, but they explain the lordship of Ireland as John found it: the grants of Leinster and Meath, the de Courcy conquest of Ulster, the Irish kings and their customs, and Gerald's advice on governing the country. Read online
  • The Song of Dermot and the Earl, Anonymous (an Anglo-Norman clerk drawing on Morice Regan, Diarmait Mac Murchada's interpreter) (about 1200 to 1225). Ends in the 1170s, so it has no 1200 events, but it was composed about then for the Marshal interest in Leinster and lists the enfeoffments by which Strongbow and Hugh de Lacy parcelled out Leinster and Meath. Read online

Sources and studies

  1. G. H. Orpen, Ireland under the Normans, vols 1-2 (1911), Internet Archive
  2. Wikipedia: Cathal Crobhdearg Ua Conchobair

Last revised 4 November 2026. Published 4 November 2026. Suggest a correction on the OMNIA Discord.