Sir Robert Croc was an Anglo-Norman

Anglo-Norman

The Anglo-Normans were mainly the descendants of the Normans who ruled England following the Norman conquest by William the Conqueror in 1066. A small number of Normans were already settled in England prior to the conquest...

 Knight

Knight

A knight was a member of a class of lower nobility in the High Middle Ages.By the Late Middle Ages, the rank had become associated with the ideals of chivalry, a code of conduct for the perfect courtly Christian warrior....

 and landowner of Scotland in the High Middle Ages

Scotland in the High Middle Ages

The High Middle Ages of Scotland encompass Scotland in the era between the death of Domnall II in 900 AD and the death of king Alexander III in 1286...

. He was gifted the Levern valley

River Levern

The River Levern, also known as the Levern Water, is a small river in East Renfrewshire and Glasgow, Scotland.The Levern has its source in Long Loch, and for a few miles divides parts East Renfrewshire, passing the village of Neilston and town of Barrhead.The Levern Valley anciently formed part of...

 in Scotland

Scotland

Scotland is a country that is part of the United Kingdom. Occupying the northern third of the island of Great Britain, it shares a border with England to the south and is bounded by the North Sea to the east, the Atlantic Ocean to the north and west, and the North Channel and Irish Sea to the...

 by King David I of Scotland

David I of Scotland

David I or Dabíd mac Maíl Choluim was a 12th-century ruler who was Prince of the Cumbrians and later King of the Scots...

 in 1170.

Crookston, Glasgow

Crookston, Glasgow

Crookston is a residential suburb on the southwestern edge of the city of Glasgow, Scotland.Formerly a village in its own right, Crookston and its surrounding lands and castle , were named after the feudal Norman lord, Robert Croc, who was gifted the Levern valley in Renfrewshire by King David I...

 takes its name from Robert Croc. Crookston Castle

Crookston Castle

Crookston Castle is located in the Crookston area of south-west Glasgow, Scotland. The castle is located some 5 miles south-west of the city centre, and 3 miles east of Paisley, overlooking the Levern Water, just before its confluence with the White Cart Water.-History:Crookston is surrounded by...

 is surrounded by a defensive ring-ditch that dates back to the 12th century when Croc, built a timber and earth castle. Remains of a chapel founded by de Croc in 1180 have been uncovered.

Croc is known to have assigned the patronage of Neilston

Neilston

Neilston is a village and parish in East Renfrewshire set in the west central Lowlands of Scotland. It lies in the Levern Valley, southwest of Barrhead, south of Paisley, and south-southwest of Renfrew, at the southwestern fringe of the Greater Glasgow conurbation...

 to the monks of St Mirren

Saint Mirin

Saint Mirin or Mirren, an Irish monk and missionary , is also known as Mirren of Benchor , Merinus, Merryn and Meadhrán. The patron saint of the town and Roman Catholic diocese of Paisley, Scotland, he was the founder of a religious community which grew to become Paisley Abbey...

's in 1163, on condition that masses

Mass (liturgy)

"Mass" is one of the names by which the sacrament of the Eucharist is called in the Roman Catholic Church: others are "Eucharist", the "Lord's Supper", the "Breaking of Bread", the "Eucharistic assembly ", the "memorial of the Lord's Passion and Resurrection", the "Holy Sacrifice", the "Holy and...

should be regularly said for the benefit of his soul.