Stanecastle was a medieval barony and estate in North Ayrshire, Scotland, first mentioned in 1363 and now part of the Irvine New Town project. Its nearest neighbours are Bourtreehill and Girdle Toll. Roman origins? The early history of Stanecastle is obscure but it was once believed that the "stane" (stone, Norse: steinn) prefix referred to older Roman structures. However, it is now known that stone building in Scotland and Ayrshire was not restricted to the Roman and Norman periods, and need not suggest any such Roman origins. Medieval life The ancient name of the barony was the "Barony of Stane (Stone)". A ley tunnel is said to run from Seagate Castle in Irvine to Stane Castle. Saint Bridget William Fraunces de le Stane held lands which included a chapel dedicated to Saint Bridget. The chapel stood on the muir near to Stane on the right bank of the Annick Water. At the core of the medieval estate may have been an older medieval nunnery or convent and evidence has been discovered (and long lost under a turnpike road) of a small medieval chapel, probably dedicated to St. Bridget and, as was the norm, had its own graveyard (also long buried underneath the road). In the 17th century the twenty shilling lands of old extent called Brydskirk are recorded, but with no mention of a chapel. Stane castle The original castle was built circa 1417 by the Francis family, who also held land at Sprouston near Kelso. The barony passed by marriage to the Montgomerys of Greenfield. In the middle-ages, Stanecastle gave way to the ever-expanding Eglinton Empire and William Francis of Stane passed his estate on to the Earls of Eglinton in the 15th century. Campbell states that the present castle was built in 1520 by Montgomerie of Greenfield, a cadet branch. In 1750 Alexander, 10th Earl of Eglinton, repaired the castle, converting it into a folly. The four open and four closed pointed windows were constructed for appearance only at this time and on the west side an armorial panel stone with the Earl of Eglinton's arms was put in place. Through some mistake this panel was said to have been placed upside down; however, the shield is actually the right way up. The apparent fault is that the signet rings and fleur de lis inside are upside down. Another error occurs on a similar-sized armorial panel now preserved