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How did patrons and clergy influence the subjects of medieval stained-glass windows?

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The north rose window at Chartres Cathedral in France, featuring intricate stained glass with vibrant geometric and biblical designs in a large circular and five tall vertical panels. — stained glass The stained-glass rose window in the north transept of Chartres Cathedral, France.

In the Middle Ages, the subjects of stained-glass windows were shaped by a collaborative relationship between the clergy, donors, and master glaziers. Because ecclesiastical art served a primarily didactic purpose, the clergy played a central role by providing master glaziers with specific iconographic programs to follow, ensuring the windows effectively expounded the Scriptures and glorified the church and its saints.1

Patrons—whether clergy or laypeople—also exerted significant influence over the choice of subject matter and its representation. In many cases, personal preferences of donors determined the themes of windows that did not fit into a broader iconographic program. By the later Middle Ages, this process became highly formalized:1
* Written Instructions: Patrons provided glaziers with written programs detailing the desired subjects.1
* Vidimus: Glaziers prepared provisional sketches, known as a vidimus ("we have seen"), which were submitted to the patron for approval before the final design was executed.1

While patrons and clerics dictated the thematic content, the master glazier remained an artist in their own right, responsible for translating these requirements into the formal language of stained glass.1