Prince of Wales - George (later George IV)
Princess of Wales - vacant
9 June - Royal assent is given to establishment of the port of Milford Haven.
Sir Herbert Mackworth gives up the Parliamentary seat of Cardiff when John Stuart, Lord Mount Stuart, comes of age.
The world's first railway viaduct (used by horse drawn wagons to carry coal from the mines) is built at Blaenavon.
Construction of the Glamorganshire Canal begins.
Monmouth County Gaol built.
John Coles, son of the founder of the Cambrian Pottery, goes into partnership with entrepreneur George Haynes, resulting in the expansion of the business.
Thomas Edwards (Twm o'r Nant) - Gardd o Gerddi
Thomas Pennant - Indian Zoology
Peter Williams - Tafol i Bwyso Sosiniaeth
27 January - William Davies Evans, mariner and chess player (died 1872)
July - James Williams, cleric and co-founder of the Anglesey Association of the Preservation of Lives from Shipwreck (died 1872)
4 July - George Everest, surveyor and geographer (died 1866)
11 August - William Probert, minister and author (died 1870)
16 September - Thomas Vowler Short, Bishop of St Asaph (died 1872)
29 September - John Jones, printer (died 1855)
20 March - Thomas Richards of Coychurch, cleric and lexicographer, 80
24 August - John Worgan, organist and composer, 66
16 October - Daniel Rowland, Methodist leader, c.79
5 November - Michael Lort, clergyman, academic and antiquary, 65
1790 in Wales Wikipedia
This article is about the particular significance of the year 1790 to Wales and its people.