Nuestros Ranchos baptismal records

Good Evening All,
On an 1886 Zac, Zac baptismal entry I came across as padrino: Sr Preb Don Francisco de P Robles, and states simply: "quien sabe su obligacion" instead of "a quienes adverti su obligacion y espiriutual, etc. which I read on the others. Could someone please help clarify/explain what the "Preb" title indicated? Thanks so much for your help. Alice B Blake