Some time before 1729 the family name of Trehearn was changed to Thomas.

The family name Goring Thomas is commemorated in Goring Road, Goring Place and The Thomas Arms in Thomas Street.

1330 Hugh Trehearn lived in the time of Edward III (1312-77).

1356 Trehearn, with other Welsh knights, accompanied the Black Prince (1330-76, son of Edward III), to the battle of Poitiers.

1550 From Elizabethan times Lletty Mawr situated 1½ miles north of the village of Llannon and just south of Tumble was the home of the Trehearn (Thomas) family.

1729 Morgan Thomas descended from Hugh Trehearn was born.

1768 Morgan Thomas (1729-1800) married Frances Goring of Frodley Hall, Staffordshire and shortly after their son Rhys Goring Thomas was born. This Rhys Goring Thomas owned land and property in Carmarthenshire and enlarged his estates by purchasing Tooting Lodge in Surrey.

1777 Around this time Morgan Thomas purchased the Parish tithes of Llanelli from the Marquis of Granby.

1800 Morgan Thomas, the grandfather of Rees Goring Thomas, died aged 70.

1801 Rees Goring Thomas, the grandson of Morgan Thomas and Frances Goring, was born.

1824 Rees Goring Thomas (1824-87) was born at Clapham, Surrey.

1830 Rees Goring Thomas (1801-63) was High Sheriff.

1834 Rees Goring Thomas (1801-63) contributed with David Lewis, Squire of Stradey, and Mr Nevill to the expense of building Loughor Bridge.

1837 Rees Goring Thomas (described as local lay impropriator) was appointed vicar’s warden at Llannon. At the time Vicar Ebenezer Morris was the perpetual curate of Llannon where it was the custom for the vicar to appoint his own warden, whereas the parishioners chose the parish warden.

George Gilbert Treherne Thomas (younger son of Rees Goring Thomas, 1801-63) was born.

1840 Gelliwernen, Llannon, situated about 1¾ miles south of the village was the property of Rees Goring Thomas (1801-63). The property was a double-pile house with a large walled garden, on a south-easterly slope. It was a newly built property in the Elizabethan style and was a spacious building consisting of, on the ground floor, Drawing Room, Dining Room, Hall, Servants’ Hall, Butler’s Pantry, Scullery, Larder, Pantry, Servants’ Bedrooms (2), Butler’s Bedroom, Wine Cellars, and on the upper floor a Large Library, Retiring Room, Bedrooms (7), Dressing Rooms (2), Bathroom, Housemaid’s Closet and WC.

1843 Gelliwernen, which was occupied by Rees Goring Thomas’s Agent Mr Edwards, was attacked by Rebecca and her daughters during the Rebecca Riots. Edwards was the tithe collector on behalf of Goring Thomas who was described as an absentee landlord.

Rees Goring Thomas presented a building and playground to the Llanelly Infant School.

1844 Rees Goring Thomas (1801-63) was one of the members of the Provisional Committee of the South Wales Railway.

1855 Rees Goring Thomas (1824-87) was a Magistrate from 1855 until his death in 1887. He also owned Dynant Fawr Colliery, Tumble.

1861 Rees Goring Thomas (1824-87) married Emily Nevill, daughter of Richard Janion Nevill of Llangennech, on 18 April 1861. At the time the Rees Goring family was living at Iscoed, St Ismael, Ferryside and the reception was held at the Thomas Arms, Thomas Street, Llanelli. There were 50 or 60 tenants present at the celebrations and in the evening the principal inhabitants of Llanelli dined at the Thomas Arms Hotel. Among those present were the Reverend Ebenezer Morris, Richard Thomas Howell, James Buckley, the Reverend David Rees, and the Reverend D M Evans. The Dafen Brass Band played a selection of music during the evening to entertain the guests.

1863 Rees Goring Thomas (b. 1801) died.

1866 Rees Goring Thomas (1824-87) enlarged and improved his father’s property in Llannon and moved in with his family.

1874 All Saints Church was built in a field valued at £356, in Goring Road just below the vicarage. The land was owned by Rees Goring Thomas who had given it for the purpose of building a church.

1887 Rees Goring Thomas (b. 1824) died.

1913 Plas Llannon, on the edge of the village of Llannon, North of the Red Lion Inn on the road leading to Tumble, which had been the home of the Rees Goring Thomas family, was advertised for sale. The property was described as a very charming middle-sized country residence consisting of, on the ground floor Hall, Drawing Room, Dining Room, Butler’s Pantry, Servants’ Hall, Larder, Pantry, Scullery, Cellars, and on the first floor, a Large Library, adjoining Retiring Room, Bedrooms (7), Dressing Rooms (2), Bathroom, Housemaid’s Closet, WC, Servants’ Bedrooms (2) and Butler’s Bedroom.

1956 Plas Llannon had been converted into a dwelling house and flats.