But isn't it rather late for a trouser role?
I was pleased to see a poster for this at Derby station yesterday.
By late, I take it you mean that there is not a later example as a lead travesti role until Rosenkavalier?
A generation before Rossini was regularly writing male juvenile leads for women (La donna del largo, Maometto Secondo, Semiramide.)
I'm sure there is one in Donizetti, but I can't for the life of me think of one.
By the time you get to Verdi, travesti roles are only supporting, or at least I can only think of Oscar in Ballo.
Who was Juliet?