I have been enjoying watching the series of "Dirty Chess Tricks" videos on YouTube, by Gunjan Jani, especially "Dirty Chess Tricks 13" on the Lewis Gambit, 1.e4 e5 2.Bc4 Bc5 3.d4.
This is an opening line that I have touched upon in this blog, starting with "SOS", writing about Secrets of Opening Surprises, Volume 10, which contained an article by Jeroen Bosch on the Lewis Gambit.
The earliest examples I have of the gambit are from an 1841 Staunton - Cochrane match, which makes it a possible inspration for Alonzo Wheeler Jerome in creating his Jerome Gambit, after the Lewis line 3...exd4 4.Bxf7+. The similarity to the Abrahams Jerome Gambit - 1.e4 e5 2.Bc4 Bc5 3.Bxf7+ - is apparent. See "Proto-Jerome Gambits? (Part 4)".
There is also a similarity to a line in the Von der Lasa Gambit, 1.e4 e5 2.d4 exd4 3.Bc4 Bc5 4.Bxf7+, as seen in J.H. Blackburne - E.J. Evelyn, blindfold, London, 1862 (1-0, 32). And let's not overlook the "Macbeth Attack".
Jani rightly points out the possibilities of the Lewis Gambit transposing to the Max Lange Gambit, the Max Lange Attack, and the Italian Gambit.
(GM Boris Alterman has a video on the Lewis Gambit as well. Dangerous Weapons: 1.e4 e5 by GM John Emms, GM Glenn Flear, and IM Andrew Greet has good coverage of where the Lewis Gambit can go if Black does not allow a Bxf7+.)