Green’s Dictionary of Slang

scanderbeg n.

also scanderbag
[Turk. proper name Iskander, Alexander, thus xenophobic equation of Turks as rascally]

a term of abuse, a rascal; also attrib.

[UK]Jonson Every Man In his Humour II i: Whoreson scanderbag rogue.
[UK]T. Randolph Hey for Honesty III i: I will be the Scanderbeg of the company / The very Tamberlain of this ragged rout.
[UK]Dryden Sir Martin Mar-all V i: Hold your Tongue you Scanderbag Rogue you.