Around the Paço dos Cunhas, other manor houses arise and become relevant in the region, such as the ones that turned out to be the House of the Counts of Santar and Magalhães and the House of the Fidalgas. This last one, of eighteenth-century construction, was apparently built near a medieval tower that existed and then was destroyed. It was also during this period that several chapels, some private some belonging to religious congregations were established.
By donation of D. Lopo da Cunha - the last of this family to reside here - the Church of the Misericórdia, was built in 1637, in whose garden - a true belvedere over a vineyard garden - some remarkable trees can still be seen today such as the araucaria araucana, the cryptomeria, the spruces, the cypresses and the camellia trees.
Loyal to the Philippine cause, in 1641 D. Lopo da Cunha will be forced to exile to Spain, after a participating in a failed conspiracy to depose D. João IV.
His property was confiscated and the family's coat of arms removed from the facade of the old palace. The “Cortes da Beira” ended thus without glory.
This was a time of change. As a reward for having supported him, in the struggle against Spain, the Duke of Bragança, now King of Portugal, brings to power other aristocratic families and members of the upper bourgeoisie. If in Santar the Restoration had caused the Cunhas to fall, other houses would also be erected, namely the Pais do Amaral.
In 1852, the administrative reform creates the new municipality of Nelas that incorporates territories formerly belonging to the municipalities of Canas de Senhorim and Senhorim.
Like other regions of the country, Santar suffered with the passage of the French troops during the Third Invasion commanded by Massena and later the damages caused by the civil war between the partisans of D. Miguel and those of D. Pedro IV.
With the advent of the Republic, the municipalities had new administrative reforms, which fell far short of what was desired. With the Estado Novo, the autarchic power was totally subjugated by the central power from an administrative and political point of view. Only after the 1974 revolution will local power be freely elected by citizens, and gain wide autonomy.