Who did Alexander the Great build a city in memoriam for?

On the BBC series "Father Brown", the titular character calls his bicycle 'Bucephalus'.

COREY, Actually, if we're going to be pedantic, it should be "whom".

COREY, Of course a horse is a ‘who’.

If an animal has a name, it's alright to call as who, those without names can be called as that or which.

COREY, Cozzy 25, Yes, you’re right! I just ruined my 100% score with this question. 😎