Llannerch-y-medd

Llannerch means "a woodland clearing". The word medd in the name is Welsh for mead, which is made from honey, and the name may be related to the production of honey for mead.^[2]

Agricultural markets began to be held in the village in the 1600s; this market was the only one to be run on Anglesey other than the market at Beaumaris. In 1831 the first wool fair was held in Anglesey, with the location alternating between Llannerch-y-medd and Llangefni. Other industries carried out in the village in the 1800s included the manufacturing of snuff and rock.^[2]

It also was home to shoemakers, who constructed the shoes for the miners in Parys Mountain. Just to the northeast of the village is the hill called Pen y Foel which is 123m above sea level; between 1951 and 1956 this was the site of a VHF Fixer station,^[3] part of the RAF Western Sector, and was one of a number similar fixed sites managed by RAF Longley Lane^[4] near Preston in Lancashire. The site contained an octagonal wooden hut with a hand-steerable radio mast with two radio receivers of type R1392D,^[5] transmitter and telephone line. This hut was protected by a close surrounding octagonal brick wall to provide some bomb blast protection which still exists. The station was used to allow each sector to locate RAF or allied aircraft and to help pilots find airfields in low cloud weather conditions. Also on the hill was a rectangular brick hut (now unroofed) also built by the RAF; this was a simple two-room hut with a rainwater collection tank. The site had three RAF wireless personnel (two were normally on duty) who were billeted with a landlady in Llannerch-y-Medd and attached to nearby RAF Valley. The site closed around 1956 as the technology was replaced by improved systems.

A claim that Mary, the mother of Jesus, is buried in the village forms the subject of Graham Phillips's The Marian Conspiracy.^[6] Mary's traditional burial place is near Ephesus, in present-day Turkey.

An electoral ward exists in the same name. This ward stretches to cover the Community of Tref Alaw with a total population taken at the 2011 census of 1,941.^[7]

The village is situated near the centre of Anglesey, close to the large water supply reservoir, Llyn Alaw, and is believed to have an ancient foundation.

A much smaller village known as Carmel, located slightly south on Holyhead Road, is governmentally part of Llanerchymedd.

In the outskirts of the village lies the Clorach Wells. These were the supposed meeting places of St. Seiriol and St. Cybi. The well was said to have sacred healing water. The well can still be seen today, it is beside a bridge in Llandyfrydog.^[8]

The disused Anglesey Central Railway runs through the village. Its station, opened in 1866, was closed in 1964 as part of the Beeching Axe, and its goods yard is now a car park. There is now a cafe and tea rooms housed in a modern extension of the old buildings.

The hill Pen y Foel is the basis for the name of the local Male Voice Choir Cor Meibion Y Foel^[9] which is a member of the National Association of Choirs.^[10] It has 43 members and rehearses in the village at Capel Ifan. Over the past decade the Choir has supported local Eisteddfodau, competed in the Anglesey Eisteddfod, raised money for numerous charities and has entertained audiences in concerts, weddings and other functions throughout North Wales.

The parish church of St. Mary exists in the village. The church building has a medieval tower, a church bell believed to be from the 18th century, and a font from the 14th century. The church, with the exception of the tower, was re-built in 1850. By 2003 the church had closed,^[2] however as of 2026 the church holds services twice a month.^[11]

• Hugh Hughes (1693–1776) a Welsh poet; lived on his estate at Llwydiarth Esgob, near Llanerchymedd.
• Owen Jones (1860-1906) a triple harpist; was born in the Britannia Inn, in the square. Him and his brothers were also harpists. He won the triple harp in the 1874 National Eisteddfod.^[12]