Mikaela F. answered 02/25/22
Degree in Research History/Art History
That is a great question.
It was probably due to changing technologies and fashions as well as ease of transport. As more and more money was put into the fine arts, which was most often directed towards the Catholic Church, larger and larger pieces were commissioned. These pieces were often painted directly on walls or ceilings, however some patrons preferred transportable paintings. Wood panels were heavy and not easily moved at a large scale. Canvas could be rolled up, protected easier, and was significantly lighter in weight. Also, canvas became a common material in places like Italy, where there was much trade and sailing activity. At the same time, oil painting came into fashion, starting in Northern Europe, and most artists (to this day) prefer oil on canvas over any other surface. So, their wealthy patrons wanted large oil pantings, and often times the artist of whom they preferred lived and worked elsewhere. It was now much easier to commission a large and expensive by a well-known artist, and have it shipped to you, at less cost and less risk.