Mac Carthaigh Riabhach
The Mac Cárthaigh Riabhach (anglicised MacCarthy Reagh) dynasty are a branch of the MacCarthy dynasty, Kings of Desmond, deriving from the Eóganacht Chaisil sept.

History
The Mac Cárthaigh Riabhach seated themselves as kings of Carbery in what is now southwestern County Cork in the 13th century. Their primary allies in the initially small territory itself were O'Donovans, and members of the Ui Chairpre; both were recent arrivals, gaining their lands from the O'Mahonys of Eóganacht Raithlind and the O'Driscolls of Corcu Loígde. The historical record for this period is very confused and a precise sequence of events cannot be reconstructed. A portion of Carbery was conquered around 1232 by Donal Gott MacCarthy, King of Desmond, from whom the dynasty descend. His son Donal Maol Mac Carthaigh, was the first ruler of the new principality. Their descendants would expand their territories considerably and forge a small, wealthy kingdom distinct and independent from the larger Kingdom of Desmond, as well as largely independent from the Earldom of Desmond and from England, which would last into the early-mid 17th century.

Fínghin Mac Carthaigh, the victor for Gaelic Desmond in the Battle of Callann and other campaigns, is considered to belong to the Mhic Carthaigh Riabhach, being a son of Donal Gott. They were in frequent conflict with the line of the MacCarthy Mor, and the MacCarthys of Duhallow and Coshmaine, all of which were generally in conflict with the Fitzgeralds and FitzMaurices which comprised the lines of the Earl of Desmond and the Earl of Kildare, respectively.

The dynasty became very successful during the 14th to 16th centuries, accumulating great wealth and possessing what was at times the most formidable, although not the largest army in the Desmond region. MacCarthy Reagh princes such as Florence MacCarthy were highly active in the politics and wars of Munster. A later branch from Bansha, County Tipperary, descendants of Donal of the Pipes, would relocate to Toulouse in France and be created the Counts MacCarthy Reagh of Toulouse (Comtes de Mac-Carthy Reagh). The renowned Jesuit preacher Nicholas Tuite MacCarthy was from this line. From another branch of the dynasty descended several more lines of counts and viscounts in France.

Florence MacCarthy was the compiler of Mac Carthaigh's Book, and the Book of Lismore was commissioned by an earlier member of the dynasty.

The controversial Blessed Thaddeus McCarthy is believed to have belonged to the MacCarthys Reagh.

The line of the Mac Carthaigh Riabhach was not represented among the Gaelic nobility of Ireland granted courtesy recognition. In the wake of the MacCarthy Mór scandal there remains much controversy surrounding the reestablishment of titles used more than 400 years ago.  However, as several branches of the sept are known to exist today, it is possible that a legitimate successor as Chief of the Name of MacCarthy Reagh of Carbery may arise. There are a few known branches of the dynasty alive today, to include the McCarthys of Dunmanway, the McCarthys of Gortnascreeny, the McCarthys of Drinagh, and the descendants of the Bernard-Leader McCarthys listed in O'Hart's Irish Pedigrees.

Princes of Carbery
 Donal Gott MacCarthy – King of Desmond and founder of the dynasty
 Fínghin Mac Carthaigh, King of Desmond – victor at the Battle of Callann
 Donal Maol MacCarthy, 1st Prince of Carbery – 1st Sovereign Prince of Carbery
 Donal Caomh MacCarthy, 2nd Prince of Carbery
 Donal Cairbreach MacCarthy, 3rd Prince of Carbery – eldest son of Donal Caomh
 Cormac Donn MacCarthy, 4th Prince of Carbery – second son of Donal Caomh, and ancestor of the Dunmanway branch
 Donal Reagh MacCarthy, 5th Prince of Carbery – a quo MacCarthy Reagh, son of Donal Cairbreach
Donal Glas MacCarthy Reagh, 6th Prince of Carbery – eldest son of Donal Reagh
 Donogh of Iniskean MacCarthy Reagh, 7th Prince of Carbery – second surviving son of Donal Reagh
 Dermod an Duna MacCarthy Reagh, 8th Prince of Carbery – third surviving son of Donal Reagh
Cormac MacCarthy Reagh, 9th Prince of Carbery – son of Donogh of Iniskean
 Finghin MacCarthy Reagh, 10th Prince of Carbery – commissioner of the Book of Lismore, eldest son of Dermod an Duna
Dermod MacCarthy Reagh, 11th Prince of Carbery – second son of Dermod an Duna
 Donal MacCarthy Reagh, 12th Prince of Carbery – Dermod's nephew, the son of Finghin
 Cormac na Haoine MacCarthy Reagh, 13th Prince of Carbery – eldest son of Donal
Finghin MacCarthy Reagh, 14th Prince of Carbery – second son of Donal
Donogh MacCarthy Reagh, 15th Prince of Carbery – third son of Donal
Florence MacCarthy
Owen MacCarthy Reagh, 16th Prince of Carbery – fourth son of Donal
Donal na Pipi, 17th Prince of Carbery – son of Cormac na Haoine, last Prince of Carbery.
 Cormac MacCarthy Reagh – son of Donal na Pipi, predeceased his father
Owen MacCarthy Reagh – second son of Donal na Pipi, founder of the Springhouse sept

MacCarthy Glas/Duna
As patrilineal descendants of the 4th Prince, but not the 5th Prince, the MacCarthys of Dunmanway, belonging to the MacCarthy Glas and MacCarthy Duna septs, are not technically MacCarthys Reagh. However, most historians and genealogists refer to all descendants of Donal Gott as MacCarthys Reagh, and it is the case that, should the "senior line", descendants of the 5th Prince, fail, then the MacCarthys of Dunmanway would become the "new" Princes of Carbery.

 Teige-an-Fhorsa MacCarthy, Lord of Glean-na-Chroim
 Teige-an-Duna MacCarthy, Lord of Glean-na-Chroim – ancestor of several surviving septs