What was the purpose of the painting of st. james the apostle?

Saint James the Greater is the patron of Pilgrims and Laborers. Meanings, definition and origins - a patron is considered to be a defender of a specific group of people or of a nation. There is a patron for virtually every cause, profession or special interest. Prayers are considered more likely to be answered by asking a patron for intercession on their behalf.

Is it even part of math