Final answer:
The Plan of St. Gall is associated with the Romanesque period, which lasted from 1000 CE to 1150 CE, preceding the Gothic, Renaissance, and Baroque periods.
Step-by-step explanation:
The Plan of St. Gall is associated with the Romanesque period, which began in 1000 CE and lasted until 1150 CE. The Plan, essentially an architectural drawing, envisages a monastic compound based on the ideals and needs of the time.
This period in European art history is characterized by its embracing of Roman, Carolingian, and Byzantine influences and its significant church building activities motivated by monasticism and religious pilgrimage.
The Romanesque period precedes the Gothic period, which started in the 12th century and continued until the end of the 15th century, and it is well-distinct from the Renaissance and Baroque periods, which followed thereafter. Moreover, the Romanesque style is noted for its thick walls, few windows, and squat structures.
In contrast, Gothic architecture is renowned for its high-reaching structures, pointed arches, and the extensive use of stained glass windows, showing a clear evolution in architectural design and artistry.