Gothic art and architecture got started sometime in the 12th century in France. It was very popular until the 16th century and was known as opus Francigenum.

Gothic architecture have its origin in France from the 12th century until the 16th century. The architecture then was popularly called Opus Francigenum which means "French work".

An opus is usually a work of art, although the term is usually used for musical pieces. If a musician - composer - creates a number of musical pieces but does not give them distinctive names, then they may be numbered and that is the opus number for that piece.

It is a person's finest work of art or literature. It is like a life time achievement.

An oeuvre is a work of art whether it be music painting or liturature. From the french meaning work,opus.