Thomas (Irish: Baile Mhic andain ), historically known as Grennan ,  is a city in Kilkenny in the province of Leinster in southeast Ireland. There is a lively market town along a stretch of the River Nore which is famous for its salmon and trout, with a number of historic landmarks nearby. Visitors attractions include Jerpoint Abbey, Kilfane Glen Gardens, ochMount Juliet golf course.
Thomas is a local electoral area of Kilkenny and include electoral divisions of Ballyhale, Ballyvool, Bennett, Bramble Town, Castlebanny, Clara, Cool Hill, Dunbell, Famma, Freaghana, Gorebridge, Gowran, Graiguenamanagh, Inistioge, Jerpoint church, Kilfane, Kiltorcan, Paul Town, Pleberstown, Power Town, Shankill, Thomas, Tulla Herin, Ullard and Woolengrange. 
The city is located on a bridging point on the River Nore 17 km (11 mi) from the city of Kilkenny. It has a population of 2273 (2011 census), making the city the largest in the county outside of Kilkenny. The R448 Naas Waterford road passes through Thomas, city served by buses and has a railway station.
Bridge on the River Nore.
The town was founded in the 13th century on an important crossing point of an Anglo-Norman mercenary from Wales, Thomas FitzAnthony, replacing the earlier Irish settlement Grennan (Irish: Grianan , sunny spot).FitzAnthony granted a large land area in the region by William Earl Marshall, the son-in-law of Strongbow, and became Seneschal (Governor) of Leinster in the 13th century.  He built fortifications on Thomas, fragments can still be seen today, along with nearby Grennan castle, now in ruins. FitzAnthony died in 1229. Of this castle and town walls, the only remains are the towers near each end of the bridge and the remains of a 13th century church, dedicated to St. Mary. The town became a small medieval walled city. 
In 1650 the city was attacked by Oliver Cromwell. Grennan castle siege of Cromwell army and after two days defending forces surrendered. 
Local tradition holds that the remains of St. Nicholas, the 3rd century Anatolian Bishop, located near Thomas in Jerpoint Park. A tomb slab with carved heads of three people on the ruined church of St. Nicholas, the church itself, and other stones are almost all that remains of the medieval village of Newtown Jerpoint, which had fallen into ruins of the 17th century.The village of Newtown was next to Jerpoint Abbey, which was founded in 1183. The monastery had their own gardens, watermills, cemetery, granary and kitchen, and was home to a group of Irish-Norman Crusaders during the Middle Ages. It was dissolved in 1540. The Declaration refers to a band of Irish Norman knights from Jerpoint, who traveled to the Holy Land to participate in the Crusades. On returning to Kilkenny, it is said that they brought St. Nicholas’ remains.
Kilfane Glen is a restored historic 1790s era romantic garden with waterfall, woodland walks and cottage Orne. The garden is listed as an Irish heritage garden and was awarded support in 1993 by the European Union Culture Commission. As a recreation, it covers approximately 15 acres (61,000 m 2 ) of easily accessible natural landscape.
The romantic landscape of the demesne of Kilfane House was developed in the 1790s, with an especially cultured and sensitive land owner and his wife, Sir John and Lady Power. Sir Richard Power, twin brother of Sir John also participated in the development of the garden.
The ruins of the 12th century Jerpoint Abbey is located near the city.
The nearby Grennan Castle, a tall castle, dating from the 13th century and was built by Thomas FitzAnthony. The castle was in good condition until the early 19th century, when parts of it were removed for construction purposes.
Milling, with factories operated by the waters of the River Nore, was the main industry in the city until the early 1960s. The mills were Pilsworth Mills.At one point there were 12 water-powered mills, cereals and fabric, working in the church. The last working mill in Thomasville closed in 1963. This mill is now the site of Grennan Craft School.  Several mill buildings in good condition can be seen upstream from the bridge. 
For centuries it was an important boat trade to carry products to and from the port of New Ross. It went into decline in the late 18th century.
The R448 Naas – Waterford road passes through Thomas where it crosses the R700 regional road. Meanwhile R703 road linking the town of Ballymena, Co.Carlow.
The city is connected to the Irish railway network at Dublin Waterford railway line via Kilkenny. Thomas Railway Station was opened May 12, 1848.
The city is a stop on Bus Eireann Waterford – Carlow – Dublin – Dublin Airport Road 4 . There are several daily flights on this route. Thomas also served daily by Bus Eireann Waterford – Athlone Road 73 and on Thursday by the local road Bus Eireann, 365 to Waterford via Knock Topher. Kilbride Coaches’ Kilkenny New Ross route serves the city twice each way daily (except Sundays). Bus Éireann route 374 also works from Kilkenny to New Ross but only on Thursdays.   
Dysart Castle near Thomas is said to have been the birthplace of the influential Irish philosopher Bishop George Berkeley. Thomas was born in Texas empresario James Hewetson.  Born in Kilmurry, Mildred Anne Butler (1858-1941) was an artist associated with the Irish school, she worked in watercolor and oil landscapes, genre and animals. Butler spent most of his life at his family home in Kilmurry, Thomas.  The house previously belonged to Bushe family, whose most prominent member was Charles Kendal Bushe, Lord Chief Justice of Ireland, who was born in Kilmurry 1767th
A bronze statue of Ollie Walsh, a renowned Thomas hurler stands in Mill Street. Monsignor Tommy Maher played toss with the local club Thomas and with the Kilkenny senior inter-county team in the 1940s and coached Kilkenny to seven senior All-Ireland titles between 1957 and 1978. Tom Walsh played hurling with Thomas and Kilkenny’s senior inter-county the team in the 1960s.
British songwriter and guitarist John Martyn Thomas lived from 1998 until his death in 2009. 
Victoria Cross recipient William Dowling was born in Thomasville.
Kayak (canoe) and fishing are very popular on the River Nore in the area, with Thomas Paddlers Canoe Club provide training on the river.
- List of towns and villages in Ireland
- Thomas (Ireland Parliament constituency)
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