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The land where modern Llanrumney stands was left to Keynsham Abbey by the Lord of Glamorgan after the Norman Conquest. According to legend, Llywelyn ap Gruffudd, the final prince of an independent Wales, was interred in a stone coffin by the monks in 1282, on land where Llanrumney Hall would be built centuries later.
After Henry VIII's dissolution of the monasteries in the sixteenth century, the land passed to the Kemeys family. It remained in their possession until 1951, when it and its grounds were compulsorily purchased by the local authority in order to build the large estates that can be seen there today.
The origins of the name Llanrumney are found in the Welsh word glan ('bank, shore') and the Anglicised version of Rhymni, the name of the local river. The substitution of glan for llan ('church') is explained by the fact that in Welsh, 'lan' is the lenited form of both glan and llan. Thus phrases such as 'i Lanrhymni' and 'o Lanrhymni' (that include the common propositions i 'to' and o 'from') could be understood as referring to a place called either Glanrhymni or Llanrhymni.
The district is a predominantly composed of large scale council estates and is bounded by the wards of Pontprennau & Old St. Mellons to the north, Rumney to the south, Penylan to the southwest, and Pentwyn to the west. The electoral ward of Llanrumney falls within the parliamentary constituency of Cardiff South and Penarth.
The area has a number of shopping preceints, the largest of which can be found on Countisbury Avenue. There is also the Eastern Leisure Centre which is scheduled to be refurbished at a cost of £6.8m. Llanrumney Hall, a reputedly haunted pub, is one of several local locations associated with the pirate Henry Morgan. and is claimed to have been his home from 1635.
Llanrumney Library opened in 2008, replacing the old Llanrumney Library.
Llanumney has six primary schools: Bryn Hafod, Pen-y-Bryn, Glan-yr-Afon, St Cadoc's, St Mellon's and Bro Eirwg, and one secondary school. Llanrumney High School closed in 2013 as part of the Council's plans to reorganise secondary education in the city.
Cardiff Bus services 49 and 50 serve the area, buses run frequently between Central station. Route 101 links Llanrumney, along with a number of other local suburbs, to the Heath Hospital. The area is currently accessible only via various junctions along Newport Road, which also connects the suburb to the city centre to the south west and St Mellons, the A48(M) and Newport to the north east.
Park and Ride facility
In February 2008, Cardiff County Council approved plans for a new Park and Ride facility to be created on the Rhymney River flood plain adjacent to the nearby Pentwyn Interchange of the A48. In November the same year the site was cleared and access roads created from the nearby A48, signalling the beginning of the project.
High School closure
On 20 March 2009 Cardiff Council published a legal statutory notice announcing their intention to close Llanrumney High School by 2012 as part of Cardiff County Council's plans to reduce surplus places in schools across the city. Pupils will be merged with those from Rumney High School, which is also to close, and will be housed at a new English medium secondary school built on the Rumney Recreation Ground. 
The plans led to the formation by residents from the communities of Llanrumney, Rumney, St Mellons and Trowbridge, Cardiff of the Rumney Recreation and Eastern Leisure Centre Action Group (RREEL), seeking to preserve the Rumney Recreation Ground from the proposed development.
A public meeting was held at the Royal British Legion in Llanrumney on 3 February 2009. Cardiff Council Leader Rodney Berman and Deputy Council Leader, Neil McEvoy, and other senior council figures sought to explain the rationale behind the plans.
Also in February the Cardiff Conference of Secondary Heads sent expressing their support for the council's plans. The three Llanrumney Labour Councillors Morgan, Parry and Joyce called on the people of Llanrumney to vote no.
Residents of Llanrumney and Rumney voted in a community poll held on 17 February 2009. The question they were asked to vote on at the ballot box was "Do you agree with Cardiff City and County Council that the new school should be built on the Rumney Recreation Ground/Eastern Leisure Centre Site?" - 93% voted against the proposed development on a turnout of 27.6%.  In Llanrumney 2,082 people voted no, 170 people voted yes and there were 18 spoilt ballots. The turnout in Llanrumney was 28.7%.
Council Leader Rodney Berman announced in response that the council's development plans would proceed and that the community poll result was noted but would not be acted upon. Cardiff Council presented these objections and their proposals to the Welsh Assembly Government on 20 June 2009. Cardiff Council's report noted that 1,257 letters of objection to the proposal were received.
- "Ward population 2011". Retrieved 8 April 2015.
- Bodinger, Katie (15 September 2006). "A journey through city's suburban past". South Wales Echo.
- Williams, Tryst (August 8, 2005). "Last true Welsh prince buried under pub?". Western Mail. Retrieved 2007-09-18.
- "Rumney Llanrumney, suburbs of Cardiff". Houses for Rent. Retrieved 2007-09-18.
- Gwynedd O. Pierce, 'Under the Eaves: Some Place Names in the Rhymni Valley Area', Morgannwg, 36 (1992), 98.
- "Cardiff Park & Ride gets Green Light". Cardiff County Council. Retrieved 2008-03-11.
- http://news.bbc.co.uk/1/hi/wales/south_east/7955231.stm BBC Wales News Online "School shake-up notice published" 20/03/2010
- "Archived copy". Archived from the original on 2010-05-22. Retrieved 2010-03-20.CS1 maint: Archived copy as title (link) RREEL Action Group website
- http://www.walesonline.co.uk/news/wales-news/2009/02/04/tough-for-berman-at-public-meeting-91466-22849543/ South Wales Echo "Tough for Berman at public meeting" 04/02/2010
- http://www.walesonline.co.uk/news/wales-news/2009/02/16/heads-in-favour-of-school-proposal-91466-22934230/ South Wales Echo "Heads in favour of school proposal 16/02/2009"
- http://www.walesonline.co.uk/news/cardiff-news/2009/02/16/councillors-appeal-over-school-plans-91466-22934232/ South Wales Echo "Councillors' appeal over school plans" 16/02/2009
- http://news.bbc.co.uk/1/hi/wales/south_east/7896283.stm BBC Wales News Online "Referendum 'no' to school plans 18/02/2009
- http://findarticles.com/p/news-articles/south-wales-echo-cardiff/mi_7993/is_2009_Feb_18/power-urges-council-landslide-campaign/ai_n38081119/ South Wales Echo "People power urges council to think again; Landslide for 'no' in the Llanrumney referendum" 18/02/2009
- http://www.walesonline.co.uk/news/cardiff-news/2009/02/20/berman-running-a-dictatorship-91466-22967646/ South Wales Echo "Berman running 'a dictatorship'" 20/02/2009
- http://www.cardiff.gov.uk/content.asp?nav=2869,3047,5087,5945&parent_directory_id=2865&id=8899&Language= Cardiff Council's response to objections received to Llanrumney/Rumney Statutory Notice (20/03?09 – 20/05/09)
- http://www.walesonline.co.uk/news/cardiff-news/2009/08/19/city-council-responds-to-objections-raised-over-new-school-plan-91466-24474726/ South Wales Echo "City council responds to objections raised over new school plan" 19/08/2009