The lands that today make up Seixal originally belonged to the Porto Moniz civil parish, when the latter was merely the headquarters of a simple chaplaincy performing the duties of an ecclesiastic parish.
Seixal, as we know it today, is very different from the way it was at that time. It has evolved from a land of passage, enticing passers-by to stay longer.
he name is thought to come from “seixo”, which means stone or pebble, but there are also those who say that it owes its origin to “seixo”, a vegetable species.
The parish was created in 1553 and although there are no historical data, it is believed that the Portuguese were the first to settle there.