Archaeological research conducted by the Discovery Programme, Ireland’s archaeological research institute funded by the Heritage Council, has been examining the nature of Gaelic lordship and settlement in north Roscommon during the later medieval period, c. 1170-1650 AD. Since 2003, elements of this work have focussed on the history and development of Tulsk, as the principal residence of the O’Conor Roe (Rua) lords. Excavation on the ringfort in Tulsk village continues to reveal a sequence of unexpected and complex settlement horizons, which include a medieval castle-building phase and an Elizabethan-period (c. 1560-90s) occupation, when the mound was included as part of the works associated with the garrisoning of Tulsk by Sir Richard Bingham, the ‘Flail of Connacht’.