Stumbled upon this Page that mentions my grandfather on my mother's side, Isabelo de Sila, as Senior Warden of the Masonic Lodge in Pampanga in the mid-1900s. A Senior Warden "is the second Officer within the Masonic Blue Lodge. He presides over the Craft during the hours of labor. The Senior Warden's primary duty is to assist the Worshipful Master in opening and closing the Lodge. In the absence of the Worshipful Master, the Senior Warden presides over the Lodge."

https://grandlodge.ph/lodges/pampanga-masonic