The Mag Dorchaidh (Darcy) were chiefs of Cenél-Luachain in the modern parish of Oughteragh. The MacRannall chiefs held much of this barony as part of the territory called Conmaicne Mag Rein.[2] During at least the 19th and 20th centuries, three annual fairs were held at Longfield townland on – 16 May, 10 October, and 27 December, while four annual fairs were held at Carrigallen on- 7 May, 9 August, 8 October, and 31 December.
There are a number of medieval artifacts from Carrigallen barony preserved in a collection at the Royal Irish Academy museum in Dublin. A small medieval brooch-pin with highly decorated penannular rings was found on the bed of the Yellow river near the Ballyduff Bridge near Ballinamore, Oughteragh parish in county Leitrim, and a bronze medieval sword blade was found in the crevice of a rock on the same river, the blade being perfect, with a broad leaf pattern, bevel edge, handle-piece welded, six rivet-holes on the handle (two not through), with hilt notches, measures 0.46 metres (1 ft 6.1 in) long by 3.2 centimetres (1.3 in) width. A Celt was found in the bed of the river at Ballyheedy bridge, at Ardrum downland near Ballinamore in county Leitrim, a good long narrow specimen, of bright yellow bronze, triangular shaped, flat-surfaced, and roughly decorated with a hammered fan-tailed ornament radiating towards the blade.
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