Finally, an Hidalgo was a minor Spanish title (roughly equivalent to a Baronet now obsolete); in the novel, it was the title Alonso Quijano had even before becoming Don Quijote.
An Hidalgo was a minor Spanish title (roughly equivalent to a Baronet now obsolete). This was finally. It was the title. This was in the novel. Alonso Quijano had even before becoming Don Quijote the title.