Heartsease is a small settlement or hamlet

Hamlet (place)

A hamlet is usually a rural settlement which is too small to be considered a village, though sometimes the word is used for a different sort of community. Historically, when a hamlet became large enough to justify building a church, it was then classified as a village...

 in the Welsh

Wales

Wales is a country that is part of the United Kingdom and the island of Great Britain, bordered by England to its east and the Atlantic Ocean and Irish Sea to its west. It has a population of three million, and a total area of 20,779 km²...

 district of Radnor

Radnor

Radnor may refer to various places:United Kingdom* Radnorshire, Wales* New Radnor, Powys, Wales* Radnor Wood, Clun, Shropshire, EnglandUnited States* Radnor, Indiana* Radnor Township, Peoria County, Illinois* Radnor, Ohio...

 and part of the county of Powys

Powys

Powys is a local-government county and preserved county in Wales.-Geography:Powys covers the historic counties of Montgomeryshire and Radnorshire, most of Brecknockshire , and a small part of Denbighshire — an area of 5,179 km², making it the largest county in Wales by land area.It is...

. It is close to the border with England

England

England is a country that is part of the United Kingdom. It shares land borders with Scotland to the north and Wales to the west; the Irish Sea is to the north west, the Celtic Sea to the south west, with the North Sea to the east and the English Channel to the south separating it from continental...

 and lies near the junction of the two counties of Herefordshire

Herefordshire

Herefordshire is a historic and ceremonial county in the West Midlands region of England. For Eurostat purposes it is a NUTS 3 region and is one of three counties that comprise the "Herefordshire, Worcestershire and Gloucestershire" NUTS 2 region. It also forms a unitary district known as the...

 and Shropshire

Shropshire

Shropshire is a county in the West Midlands region of England. For Eurostat purposes, the county is a NUTS 3 region and is one of four counties or unitary districts that comprise the "Shropshire and Staffordshire" NUTS 2 region. It borders Wales to the west...

.

Historically, it was part of the Parish of Stanage

Stanage

Stanage Edge, or simply Stanage is a gritstone escarpment in the English Peak District, famous as a location for climbing. The northern part of the edge forms the border between the High Peak of Derbyshire and Sheffield in South Yorkshire. Its highest point is High Neb at above sea level...

. For historical population figures see Powys History Project. The hamlet lies on the A4113 road

A4113 road

The A4113 road is a single-carriageway east-west road that runs along the Teme Valley crossing the border of Powys and Herefordshire, , its eastern end being in Shropshire.-Route :*Knighton - junction with A488*Milebrook...

 between Knighton and Ludlow

Ludlow

Ludlow is a market town in Shropshire, England close to the Welsh border and in the Welsh Marches. It lies within a bend of the River Teme, on its eastern bank, forming an area of and centred on a small hill. Atop this hill is the site of Ludlow Castle and the market place...

 and is just a few hundred metres from the River Teme

River Teme

The River Teme rises in Mid Wales, south of Newtown in Powys, and flows through Knighton where it crosses the border into England down to Ludlow in Shropshire, then to the north of Tenbury Wells on the Shropshire/Worcestershire border there, on its way to join the River Severn south of Worcester...

.

A romantic legend attributes the name to a comment made by Owain Glyndŵr

Owain Glyndwr

Owain Glyndŵr , or Owain Glyn Dŵr, anglicised by William Shakespeare as Owen Glendower , was a Welsh ruler and the last native Welshman to hold the title Prince of Wales...

 whose heart was set at ease when he glimpsed Wales

Wales

Wales is a country that is part of the United Kingdom and the island of Great Britain, bordered by England to its east and the Atlantic Ocean and Irish Sea to its west. It has a population of three million, and a total area of 20,779 km²...

 upon returning from England

England

England is a country that is part of the United Kingdom. It shares land borders with Scotland to the north and Wales to the west; the Irish Sea is to the north west, the Celtic Sea to the south west, with the North Sea to the east and the English Channel to the south separating it from continental...

.

More recently, the television programme Tom Sharpe

Tom Sharpe

Tom Sharpe is an English satirical author, best known for his Wilt series of novels.Sharpe was born in London and moved to South Africa in 1951, where he worked as a social worker and a teacher, before being deported for sedition in 1961...

's Blott on the Landscape

Blott on the Landscape

Blott on the Landscape is a novel written in 1975 by Tom Sharpe. It was adapted into a 6-part television series for the BBC in 1985.-Plot:The story revolves around the proposed construction of a motorway through Cleene Gorge in rural South Worfordshire...

was filmed at nearby Stanage Park

Stanage Park

Stanage Park is a park located some 3 miles east of Knighton, Powys and near the settlement of Heartsease.It is an outstanding picturesque parkland laid out by Humphry Repton. The last and most complete of his three recognized Welsh landscape commissions...

.

Today the settlement is best known as the home of Radnor Hills, a business bottling local spring water.