Editing Cardiff (section)

==Toponymy==
{{lang|cy|Caerdydd}} (the [[Welsh language|Welsh]] name of the city) derives from the [[Middle Welsh]] {{lang|wlm|Caerdyf}}. The change from {{lang|wlm|-dyf}} to {{lang|cy|-dydd}} shows the colloquial alteration of Welsh ''f'' {{IPA|cy|v|}} and ''dd'' {{IPA|cy|ð|}} and was perhaps also driven by [[folk etymology]]. This [[sound change]] probably first occurred in the [[Middle Ages]]; both forms were current in the [[Tudor period]]. {{lang|wlm|Caerdyf}} has its origins in [[sub-Roman Britain|post-Roman]] [[Brythonic languages|Brythonic]] words meaning "the fort of the [[River Taff|Taff]]". The [[Cardiff Roman Fort|fort]] probably refers to that established by the [[Roman Britain|Romans]]. {{lang|cy|Caer}} is Welsh for ''fort'' and {{lang|cy|-dyf}} is in effect a form of {{lang|cy|Taf}} (Taff), the river which flows by Cardiff Castle, with the {{angle bracket|t}} showing [[consonant mutation]] to {{angle bracket|d}} and the vowel showing [[affection (linguistics)|affection]] as a result of a (lost) [[genitive case]] ending.<ref name=hwo>Hywel Wyn Owen and Richard Morgan, ''Dictionary of the Place-names of Wales''. University of Wales Press, 2007, {{ISBN|1-84323-901-9}}, p. 70.</ref>

The [[anglicised]] ''Cardiff'' is derived from {{lang|wlm|Caerdyf}}, with the Welsh ''f'' {{IPA|cy|v|}} borrowed as ''ff'' {{IPAc-en|f|}}, as also happens in ''Taff'' (from Welsh {{lang|cy|Taf}}) and ''[[Llandaff]]'' (from Welsh {{lang|cy|Llandaf}}).

The antiquarian [[William Camden]] (1551–1623) suggested that the name Cardiff may derive from *{{lang|wlm|Caer-Didi}} ("the Fort of Didius"), a name supposedly given in honour of {{lang|la|[[Aulus Didius Gallus]]|italic=no}}, governor of a nearby province at the time when the Roman fort was established. Although some sources repeat this theory, it has been rejected on linguistic grounds by modern scholars such as Professor {{lang|cy|Gwynedd|italic=no}} Pierce.<ref>{{Cite web |url=http://www.bbc.co.uk/wales/whatsinaname/sites/videoexplorer/pages/?jumpTo=cardiff |title=What's In A Name? – Cardiff |last=Pierce |first=Gwynedd O |publisher=BBC Wales |access-date=17 July 2008 |url-status=dead |archive-url=https://web.archive.org/web/20090115122320/http://www.bbc.co.uk/wales/whatsinaname/sites/videoexplorer/pages/?jumpTo=cardiff |archive-date=15 January 2009 }}</ref>