This rosewater-flavoured jelly was served at Henry VIII's garter feast at Windsor in appearing in both the first and second course.
Have you followed the link? There's a **** ton of desserts, lemon hellos may well feature.
We don't say jello, it's jelly over here. I get a red line when I write jello.
Jello=hospital idea of dessert. Usually it is green or yellow.