The Geteld
The geteld is a form of tent known in continental Europe and in Anglo-Saxon England.
A picture from the Utrecht Psalter.

A couple of pictures from the Harley Psalter.
Just to keep things in perspective on sizing, here's a building to show scale.

While I was in the UK, I saw this tent at the Hasting reenactment.
Many manuscript illuminations of getelds and other sorts of tents, seem to show toggles on the door such as shown here. If you look carefully, you will see that it appears the door is curved, not straight.
Other online information on getelds: