Learning Some History From Fiction

There is:

historical fiction;

sf about time travel which can be historical;

other fiction which can be about historians who discuss their work.

 

Poul Anderson's Time Patrol agents have to intervene in the Second Punic War to prevent Hannibal from sacking Rome.

 

A dinner guest of Isaac Asimov's Black Widowers is a historian who comments that:

 

Rome and Carthage were "'...nearly equally matched powers...'" -Puzzles Of The Black Widowers (London, 1991), p. 94;

Hannibal, Napoleon and Robert E. Lee were the three great generals who lost but kept their reputations.

And I did not know all of that. It is good to find some common ground between series as diverse as the Time Patrol and the Black Widowers.