Question: Valentino Urbani sang the role of Eustazio at the premiere of what opera that was composed in 171, and was the first Italian language opera written specifically for the London stage?
Sentence (from "Valentino Urbani"): He sang the role of Eustazio at the première of Handel’s "Rinaldo", the role of Silvio at the premiere of "Il pastor fido", and the role of Egeo at the first performance of "Teseo".
Relevant evidence: Yes