S4C was launched on November 1, 1982 in Wales, one day before Channel 4 in the rest of the United Kingdom, and used the "WALES4CYMRU" logo. S4C stands for Sianel Pedwar Cymru which is Welsh for Channel 4 Wales.
In 1988, the ident changed to a computer-generated ident featuring an animation of the streamlined S4C logo, the colours of the logo were blue, green and red and the font was "Bodoni". The early 1990s saw a more "traditional" ident from S4C, depicting a piece of Welsh slate with colour blue green and red washing over the letters S4C.
On March 7, 1995, S4C introduced a new logo, with a red tilde resembling a dragon's tongue at the end of the S4C wordmark and the font was "Futura".
And the star of the logo, the dragon, is seen in the idents of the channel.
This logo was introduced on January 18, 2007. It was part of a total rebrand of the channel made by Proud Creative. In the rebrand, stereotyphical Welsh icons such as dragons were avoided in favour of an "inherently Welsh" tone.
A new S4C logo and brand developed by Sugar Creative Studio was introduced on 10 April 2014; the new design was developed around a concept of providing "context" to S4C's target audience and programming. The design revolves heavily around a trapezoidal shape used within the channel's new logo, which is prominently used within aspects of the channel's overall marketing and branding.
Sianel 4 Cymru