Yes flobabdob - it happened in 1755 with a large M9 (or nearly 9) just off Portugal - well between Portugal, the Azores and Gibralter - about 120 miles WSW of Cape St Vincent. This was on the Azores-Gibralter-Transform Fault.
The earthquake did immense damage in Lisbon but, just like Sendai today, it was the tsunami that really did its worst. The Tagus estuary emptied revealing old shipwrecks etc and then in came the tsunami destroying all the lower town - the Royal Riberia palace went, most of the 16thC Manueline architecture, the new Opera House - along with a signficant collection of Titian, Rubens and Correggio paintings, and historical documents such as the papers of Vasco da Gama's circumnavigation of the globe.
Some 2/3rds of the city was inhabitable and whole communities in the Algarve were wiped out. In Spain there were over 1200 deaths.....
Just as you are seeing today, what the water did not get, the fires added to.......unfortunately it happened on a day of celebration and holiday, All Saints Day, which was also a reason for the numbers dead and the resultant questioning of God in what was a bastion of Catholicism, perhaps second only to Rome at that time.
It was considered at the time as the equivalent of the Holocaust - no-one knows the deaths but possibly 100k+ and it's profundity had significant impact on socio-philisophical-religious thinking in the emerging Age of Enlightment. It destroyed Portugal's economy and position in the world, though it did lead to the establishment of seismology as a discipline.
Yes, the South-coast of the UK was hit by the tsunami, with some 8 to 10 ft waves that caused significant damage and deaths as it swept in. Galway in Ireland even lost part of its city walls, known as the Spanish Arch........