The Castle´s Church dates from 1165, although only in the reign of Sancho I started the construction of a larger Romanesque church – Gothic called Santa Maria do Castelo.

In the year 1165 was created the Parish of Our Lady of Sesimbra Castle.

The present church is from the early eighteenth century, 1721, as it suffered serious damage over the centuries.

In the 20th century, during 1955 the church loses faithful because a new church was born, much closer to the population. And the Castle Church begins to degrade with the ceiling dropping.

In order to rehabilitate the church, there were several interventions between 1965 and 2001, the year it was again open to the public.

This reopening coincides with nine centuries of history, eight years of the charter letter which laid the foundation for the Church of Our Lady of the Castle.