the Knights Hospitaliers bought the are and built the castle; they said so in the video. also star forts are a later development in response to the rise of gunpowder centuries later. Belvoir would be closer to a concentric castle where the outer wall was disconnected from the keep. Beaumaris Castle is another, and probably most popular, example of a concentric castle.
Who built it? that's a Star Fort, those things are all over the planet
the Knights Hospitaliers bought the are and built the castle; they said so in the video. also star forts are a later development in response to the rise of gunpowder centuries later. Belvoir would be closer to a concentric castle where the outer wall was disconnected from the keep. Beaumaris Castle is another, and probably most popular, example of a concentric castle.