1327 The Fresco of Guidoriccio da Fogliano by Simone Martini, Italy. The distance of the side ropes from the tent makes it look like no side poles were used. Wedge structures look like they are covered in thatch.
Back row: left corner - a fairly simple 'squarish' pavilion. The one almost central on the back row - square with round-tower corners. That could be awesome! (pics from Tentorium website)
SCA Tent history and discussion. Lots of pictures. The Design of Medieval and Renaissance Pavilions by Erika Hepler known in the SCA as Philippa Montague
Kunst : Pavilions and tents from the 15th century, detail from the History of Judith, 1878, engraving from Dictionary of Furniture and Decoration, Volume III, by Henry Havard.
Carousel Pavilion with Dining Fly: Made by a couple who live in Arizona, the central band lists the seven cardinal virtues. The rayony theme is continued in the interior, where some of the wheel supports are carved and gilt, and the central pole is carved in a thick spiral. This encampment is so lovely!
The Carlos V Tent. 1542-1545. Museo del Ejercito, Madrid.