The lands of Coolmine were in the thirteenth century the property of the Bermingham family, but were in 1303 conveyed by Peter, son of James Bermingham, who had purchased the fee from Richard, son of Lord Maurice Bermingham, to Peter Hacket. The reign of fire and sword in the beginning of the fourteenth century reached Saggart as well as other places similarly situated. In the yeare 1311, on the morrow of St. John the Baptist's day, as we are told, the O'Tooles [Leinster] and O'Byrnes [Galway] invaded the lands of Saggart and Rathcoole, and although a great army was afterwards sent into their territory to reduce them to obedience, their invasions did not cease for some time. In the middle of that century, in the yeare 1359, there is again mention of raids on Saggart, and, as we have seen under Dundrum, William Fitzwilliam of that place, who was accompanied by one of the Harolds, performed valiant service in rescuing prey which the Irish tribes were carrying off, and in killing five of the King's enemies. The only events of importance recorded to have occurred at Saggart for the next hundred years are in connection with warfare.
aheen or parish of Collcraheen, Kilmacar, Mayne, Conaghy , barony of Fassadinin was once probable from the Knights Fees, a valence-purparty 1247-1324 in counties, Wexford, Carlow, Kilkenny. Those were known as Ossory, Leix, counties of Non-Laigain tribes which is surprising for life in Pictland and also known as Naas, these were home to "the Four Tribes of Tara." in and around Meath. The Loígis, Laígsi or Laoighisi, were mercenary tribes of the Laigin and possibly of Cruithin (Pict) origin. Wexford then included most of Naas, Ossory and Leix and some of Desmond and Dublin-Kerry. Neutral tribes of Ulster and Connacht Cruachan and Gailenga-Luigne were among the pre-Milesian tribes of Connacht the Gregraige, a Firbolg tribe of Leinster. From another are of Ulster, the Uladh or Ulidians are more druidic and believed Dál Riata and the Picts, like the Érainn settled Scotland before Ireland . The Ciarrage tribes or "black people" populated much of northwestern County Roscommon and are believed to have been the early Lords of Airtech, an area corresponding to the present-day barony of Frenchpark. In this parish are, near the village of Saggart two pillar stones known locally as Adam and Eve; in the townlands of Raheen a pillar stone and a cairn known as Rathin bank; in the townland of Glenaraneen a sepulchral mound known as the hungry hill. Raheen in Offaly and Rathin Isle of Man.
AGART PARISH now contains the townlands of Boherboy (i.e., the yellow road), Brownsbarn, Coldwater Commons, Cooldown Commons, Coolmine (i.e., the smooth hill back), Crooksling, Fortunestown, Glenaraneen, Lugg (i.e., the hollow), Moneenalion (i.e., the little bog of the flax) Commons Upper and Lower, Newtown Upper and Lower, Raheen (i.e., the little rath), Saggart, Slade (i.e., the mountain stream). This parish appears in the seventeenth century as containing the townlands of Saggart, Newtown, and Coolmine. The Hill of Saggart, or Slievethoul, is within the parish. There are wells known as St. Catherine's well and St. Bridget's well. Neighboring parishes are St. Catherines, St. Georges, St. Marks, St. Nicholas, St. James...
Townlands of Saggart: Baldonnell Little, Baldonnell Lower, Baldonnell Upper, Boherboy, Brittas Big, Brittas Little, Brownsbarn, Coldwater Commons, Cooldown Commons, Coolmine (in the parish of Saggart), Crooksling, Fortunestown, Glenaraneen, Kilbride, Kilcarbery. Llugg, Moneenalion Commons Lower, Moneenalion Commons Upper, Moneyatta Common, Raheen (in the parish of Saggart), Saggart and Slade.
Rathcoole is particular resides in modern day Kerry and Dublin where Rathcoole is much like Saggart. One Tipperary list has householders from 1766. The village of Rathcoole, which was ruled like Saggart by a portreeve or provost, became in the succeeding centuries a place of considerable importance, and contained several fortified houses. The village of Rathcoole, which was the first stage on the coach road from Dublin to the south of Ireland, and which lies in one of the most important hunting districts near Dublin, is the centre of a parish called by the same name, which extends from the parish of Clondalkin to the County Wicklow, and is bounded to the east by the parish of Saggart.
The village of Saggart, which lies between the villages of Tallaght and Rathcoole, and is approached either from the road from Tallaght to Blessington, or from the great southern highroad near Rathcoole, was situated just within the barrier of the Pale. Tallaght is the site of St. Mael Ruain's church, original home of the monastery called “Eyes of Ireland”, founded by the leader of the anchorite movement. The Vikings burned it in AD 811; the parish church was built on the site. Saggart has a number of prehistoric sites and was the site of a monastery in Celtic times: the Torridge Valley, Cashel, Raphoe. A mill at Saggart and the pleas and perquisites of the manor court were also sources of revenue to the royal exchequer. The Court fees were leased like the lands for a fixed yearly sum, and in 1291 two of the Saggart tenants had to find security to keep the peace owing to the opposition which they had offered to the lessee, one Henry de Compton, clerk. As in the case of Bray, a leading mercantile family in Dublin took its cognomen from Saggart; in 1282 John and Richard de Tasagart were paid for thirteen hogsheads of wine sent to Wales for the King's use, and later on John accounted at Drogheda for duty on wines. Amongst the other lands now comprised in the parish of Saggart are those of Coolmine and Newtown.