TV adaptation of The First Men In The Moon squared Cavor and Bedford with Armstrong and Aldrin.
In Poul Anderson's Works
Many events in the Time Patrol timeline are down to the presence of time travelers.
In another time travel scenario, an anachronistic galleon sailed near Atlantis but was destroyed.
In Poul and Karen Anderson's The King Of Ys
Julius Caesar did not record his visit to Ys.
Niall of the Nine Hostages felt obliged to destroy Ys in revenge for his son and fleet but was not proud of the underhand means that he had had to use so he forbade people to talk about it and poets to celebrate it. The flooding of Ys will become at most a folk tale without Niall's name attached to it. So it is.
We want fiction often to be fantastic and usually also to be consistent with the known facts.