This townland, spelled Coolhane, in the Ordnance Survey Name Books was first mentioned during the reign of Elizabeth I (1558-1603). At the time of James I (1603-1625) the spelling of the name changed to Cowlbane. The Irish form of the name was given as Cúl Bán, meaning white back. George D.H. Kirkaldy wrote the name as Coolbawn or Coolbane, and Rev. Francis Coghlan spelled it as Coulbane. It is officially recorded today as An Chúil Bhán. The standard name was given as Coolbawn and Coolbaun. The OS Books showed the presence of one house, two ruins, a limekiln and trigl. station, a small portion of fir planting, a sand pit with the southern extremity of the townland inundated (flooded).
It lies between Rathmore Demesne, Ahanduffmore, Connor’s Park, Coolbaun West and Clooncona in Killimorbologue and by Carhoon and Raheen in Tynagh parish.
Census 1841, 1851
Census statistics did not record any houses in this townland during the famine period or afterwards.
Griffith’s Valuation 1855
Griffith’s Valuation gave the total acreage as eighty seven acres and five perches, all owned by George D.H. Kirkaldy. He retained eighty five acres, three roods and twenty two perches for himself, and leased out one acre and twenty three perches, to Andrew Kane at a total annual valuation of £1.0s.0d.