The source of the famous 1 November, 1755 “Lisbon” earthquake has been constrained to be an up to 200 km long structure in the offshore west of Cabo de S. Vincente. The magnitude of this earthquake was estimated in the range of 8.5–9.4. The stress regime argued for this shock would have been characterised by an around NNW–SSE-oriented compression. Less well studied is the successive “Meknes” earthquake, which occurred a few days later in Morocco (27 November), and was erroneously confused by the European contemporary reports with a strong aftershock, occurred on 18 November, of the main seismic sequence of the 1 November earthquake. The Meknes earthquake had destructive effects in the region of Meknes and Fes and along the E–W trending Rides Prérifaines, the main frontal thrust of the Rif. Historical data indicate a macroseismic field closed around the towns of Meknes and Fes.