Cardif

Cardif is a large city located in Wales where it lies as the capital of the Kingdom of Wales, and the seat of House Bowen.

Etymology
Caerdydd (the Welsh name of the city) derives from the earlier Welsh form Caerdyf. The change from -dyf to -dydd shows the colloquial alteration of Welsh f [v] and dd, and was perhaps also driven by folk etymology (dydd is Welsh for 'day' whereas dyf has no obvious meaning). This sound change had probably first occurred in the Middle Ages; both forms were current in the Tudor period. Caerdyf has its origins in post-Roman Brythonic words meaning "the fort of the Taff". The fort probably refers to that established by the Romans. Caer is Welsh for fort and -dyf is in effect a form of Taf (Taff), the river which flows by Cardiff Castle, with the ⟨t⟩ showing consonant mutation to ⟨d⟩ and the vowel showing affection as a result of a (lost) genitive case ending.