It was forced to accept that all of its traffic must pass through the "Aachener Reich".
In 936, Otto I was crowned king of East Francia in the collegiate church built by Charlemagne.
During the reign of Otto II, the nobles revolted and the West Franks, under Lothair, Over the next 500 years, most kings of Germany destined to reign over the Holy Roman Empire were crowned in Aachen.
Latin Aquae figures in Aachen's Roman name Aquae granni, which meant "waters of Grannus", referring to the Celtic god of healing who was worshipped at the springs.
This word became Åxhe in Walloon and Aix in French, and subsequently Aix-la-Chapelle after Charlemagne had a cathedral built there in the late eighth century and then made the city his empire's capital.
Aachen became the focus of his court and the political centre of his empire.
After his death, the king was buried in the church which he had built; his original tomb has been lost, while his alleged remains are preserved in the shrine where he was reburied after being declared a saint; his saintliness, however, was never very widely acknowledged.Later, the 25-hectare Roman spa resort town of Aquae Granni was, according to legend, founded by Grenus, under Hadrian, around AD 124.Instead, the fictitious founder refers to the Celtic god, and it seems it was the Roman 6th Legion at the start of the 1st century AD that first channelled the hot springs into a spa at Büchel, sanctuary dedicated to Grannus.A kind of forum, surrounded by colonnades, connected the two spa complexes.There was also an extensive residential area, part of it inhabited by a flourishing Jewish community.("and [he] celebrated Christmas in the town Aquis, and similarly Easter") which must have been sufficiently equipped to support the royal household for several months.