Ríocht Dheasumhan

Ríocht stairiúil i n-iardheisceart na hÉireann ab ea Deasmhumha nó Deasmhumhain. Bunaíodh sa bhliain 1118 í ag rí Tadhg Mac Cárthaigh, when the Treaty of Glanmire formally divided Ríocht na Mumhan into Deasmhumha agus Tuadhmhumha. It comprised all of what is now Contae Chorcaí and most of Contae Chiarraí. Desmond was ruled by the Mic Cárthaigh dynasty. Other clans within the kingdom included the Uí Shuilleabháin agus Uí Dhonnabháin.

Following the Norman invasion of Ireland in the late 12th century, the eastern half of Desmond was conquered by the Anglo-Normans and became the Earldom of Desmond, ruled by the FitzGeralds and Fitzmaurices. The king of Desmond, Diarmaid Mac Cárthaigh, submitted to Henry II of England, but the western half of Desmond lived on as a semi-independent Gaelic kingdom. It was often at war with the Anglo-Normans. Fínghin Mac Carthaigh's victory over the Anglo-Normans at the Battle of Callann (1261) helped preserve Desmond's independence. Following the Nine Years' War of the 1590s, Desmond became part of the Ríocht na hÉireann.

Bhunaigh ríthe Deasmhumhan suíomhanna amhail is Caisleán na Blarnan, Caisleán Bhaile Uí Chairbre, Mainistir Mhucrois agus Cill Chré.