Sir Simon Russell Beale (Simon Strong) was diagnosed with cancer shortly after filming Season 3
https://www.standard.co.uk/showbiz/house-of-the-dragon-sir-simon-russell-beale-colon-cancer-b1280322.html
He seems to be in recovery now but how dreadful! Insane that he kept up his schedule whilst all of this was happening.
u/edminzodo — 2 days ago