Harald Bluetooth built some amazing fortifications for his period of time: https...

		dybber on Feb 1, 2022 \| parent \| context \| favorite \| on: Origin of the Bluetooth Name Harald Bluetooth built some amazing fortifications for his period of time: https://en.m.wikipedia.org/wiki/Viking_ring_fortress https://www.researchgate.net/publication/263286349_A_Palisad...