The first Iberian document to refer to Sete Cidades was a Latin chronicle from the city of Porto-Cale (the modern city of Oporto), written in 750 A.D. by a Christian cleric. During this era, the Iberian Kingdom of the Visigoths was in the process of collapse, under pressure from Muslim invasions (which began in 711 A.D.). The Visigoth archbishop fled to Porto-Cale, fearing the assault of the Muslim forces, where he deliberated an escape to the lands in the Western Sea, which sailors insisted existed. In 734, the archbishop, accompanied by six other bishops, their prelates and approximately 5000 faithful, sailed away in a fleet of twenty ships. The chronicle indicated that the fleet arrived at their destination, burned their ships and established seven Christian communities under the reign of the seven religious leaders. Although many prepared to follow, in truth, the archbishop (if he existed) was never heard from again, nor was the route to the mythical lands established.