Founded in 1545 by King John III and designed by the prominent Renaissance architect Diogo de Torralva, this church represents a sophisticated blend of Gothic and Manueline styles, far removed from the ostentation of the nearby royal palaces.

The church was built with a clear social mission: to act as the home of the Santa Casa da Misericórdia, an institution dedicated to providing spiritual guidance and charitable aid to the town's vulnerable. Its facade, marked by an intricate Manueline portal and distinctive twisted columns, speaks to a period when architecture was used to signify grace and communal duty rather than raw political power. Inside, the single nave is lined with classic blue-and-white azulejos depicting biblical scenes, culminating in a poignant main altar painting that portrays Our Lady of Mercy sheltering the inhabitants of Sintra beneath her mantle.

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While Sintra is defined by its dramatic mountain peaks and fairy-tale estates, this church provides a necessary, grounded contrast. It remains an active place of worship and a monument to the town’s centuries-old commitment to compassion. Stepping inside today offers a rare, hushed moment of clarity, reminding us that the true heartbeat of any historic town is found in its capacity for mercy.