Published in 1738 and authored by one Fr. Juan Francisco de S. Antonio, this book of three parts has a chapter (XVI) dedicated mainly to the Embocadero (San Bernardino Strait) where Bulusan was mentioned.
Chapter XVII De la Isla de Luzon, also bears Bulusan's name.
For both chapters, it appears that Bulusan was a usual geographical point of reference being the southernmost point of Luzon during that period. Matnog, which now holds the title, was to separate from Bulusan only in 1785.
The chapter on Zamboanga also mentions its distance from Bulusan.
Chapter XXVIII mentions watchtowers and fortresses in detail. No entries for Bulusan nor for the entire Bicolandia. We must remember that this was 1738. They would be built in the second half of the 1700s.
"Punta de Bulusan" was the common reference to the town, literally meaning, "point of Bulusan." This should not to be confused with the way the word "Punta" was attached to the town's fortress.
"Punta de Santiago" makes an appearance as well, but it is again highly doubtful that this would be in reference to the town's fortress. It could most probably be in reference to Santiago de Libon, the first-ever parish in the region, farther north of Bulusan.
[Note: A former college professor recently pointed out that the use of "Punta" in Bulusan's fortress, "Punta Diamante," is erroneous and misleading, as the term should only be used to refer to a natural geographical point. He however concurred with my suggestion that the correct-albeit-forgotten name might have indeed been, "Fuerza y Iglesia de Santiago," as it had been the convention to name fortresses and churches after the locality's patron saint. Archival documents are yet to be unearthed in support of this theory, or that of my other theory, i.e., that the term might have been in fact intentional, perhaps in an attempt not to have another "Fuerza de Santiago," which was actually the name by which Fort Santiago in Intramuros was known during those times.]
