The 'This is fine' meme is way older than anyone had expected.

This 14th-century manuscript illustration shows the legendary 5th-century British king Vortigern in his burning castle.

More on the illustration here:
https://thehistorianshut.com/2020/10/14/illustration-depicting-the-demise-of-vortigern-from-a-14th-century-manuscript/

British Library royal ms 20 a ii f3r