How could we marry Catherine of Valois to Owen Tudor without Catherine of Valois marrying Henry V, is it possible for Kate of Valois to marry Owen Tudor earlier than OTL?
No, it is not at all possible. Owen Tudor was in Henry V's household, and remained there after Henry V's death. It was then that he met and married Catherine of Valois. If she had not married Henry V, there is no way that the daughter of a French king could ever, ever marry an obscure Welsh squire.
Scipio
No, it is not at all possible. Owen Tudor was in Henry V's household, and remained there after Henry V's death. It was then that he met and married Catherine of Valois. If she had not married Henry V, there is no way that the daughter of a French king could ever, ever marry an obscure Welsh squire.
Scipio
It qualifies as "if it didn't happen we'd call it unrealistic" more than most events labeled that here even with that.