I have been looking at extant examples of portable furniture from that period and have found variations of this chair from both England and Spain. I haven't looked at French furniture yet, but I suspect they also have a variation. (FYI, I took a brief look at French furniture yesterday and the form--"Caquetoire Garnie"-- does appear.) Some versions seem to collapse by removing the spreader bars between the sides, others may add or substitue hinges in the spreader bars, and some versions add hinges or other joints halfway down the legs for an additional point of collapse.
I'll add detail of my sources ASAP (NOTE: sources now added), but in the meantime I wanted to share my sketch-up model of a type of chair which I have never seen in my (admittedly limited) experience of SCA camping. To wit,
the Friar's (Monk's) chair
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Folding sillon frailero of walnut (sixteenth century)
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Folding sillon frailero (sixteenth century)
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