Llanishen (Welsh Llanisien llan church + Isien Saint Isan) is a district and community in the north of Cardiff, Wales. Its population as of the 2011 census was 17,417. Llanishen is the home of the former HMRC tax offices, the tallest buildings in north Cardiff and a landmark for miles around. The office complex overlooks the Crystal and Fishguard estates, the Parc Tŷ Glas industrial estate, Llanishen village, leafy suburban roads and parks that constitute the district. Llanishen is also home to a leisure centre and the former Llanishen Reservoir, which is connected to a green corridor which bisects the city. History Originally wooded farm land, in A.D. 535 two monks came eastwards from the small religious settlement of Llandaff, aiming to establish new settlements, or "llans", in the land below Caerphilly Mountain. With fresh water from the Nant Fawr stream, one of the monks, Isan, founded his llan on the site of the modern day Oval Park. In 1089 at the Battle of the Heath, the Normans fought the Welsh Celts north of the settlement. The victorious Normans expanded Llanishen, starting work on a church to the north which was completed in the 12th century. Although Oliver Cromwell had ties with Llanishen and the neighbouring village of Llysfaen, the village remained undisturbed until 1871, when the Rhymney Railway was given permission to break the stranglehold of the Taff Vale Railway into Cardiff Docks. Building a line from Caerphilly to Crockherbtown Junction just north of Cardiff Queen Street, its tunnel to the north resulted in the accidental deaths of a number of people, many of them buried in St Isan's church. The railway and the development of Llanishen railway station allowed wealthy Cardiff businesspeople to commute from the village to the city centre easily, resulting in the expansion of the village's population by 20,000 between 1851 and 1871. In 1887, the two new reservoirs of Llanishen were built to allow distribution of water collected in the Brecon Beacons to the city. In 1922, after expansion north by the city and south by the village, Llanishen became a suburb of Cardiff. Llanishen Golf Club was established in 1905. Development of the village since has been through redevelopment of former farming and military land into commercial usage and housing development. Thornhill was part of the Llanishen civil parish until November 2016, when a new community of Thornhill was created north of the