The house was built in 1772 by the Spanish settler Antonio Martínez Sáenz who was married to the Paraguayan Petrona Caballero de Bazán.

Besides the two married couples, two young ladies, Facunda Speratti and Virginia Marín, sisters of Carmen and Nicolasa, lived in the house.

Due to these circumstances and its location, the residence of the Martínez brothers became the perfect place to conceal the secret meetings that were held to organize the conspiracy against the Spanish rule.

Here is also exhibited a bureau which belonged to Fernando de la Mora and five pictures, among which one stands out, representing a key moment of the independence – the intimidation of Governor Velazco, painted by Jaime Bestard.

A sword which belonged to Fulgencio Yegros is exhibited in one of the windows, as well as a highlighted portrait of Doctor José Gaspar Rodríguez de Francia.

A large chest used by Juan Bautista Rivarola, a peculiar toilet, a magnificent prie-dieu and a polychrome niche complete the atmosphere of the room.

Below them, there are the remains of the disappeared eaves of the house, which give us an idea about the measurements and characteristics of the materials used in constructions during the colonial period.

Here you can read the text of the note of 20 July 1811, addressed to the Primera Junta in Buenos Aires, in which the independence of Paraguay was asserted.

A tumulus covering the mortal remains of the illustrious patriot Juan Bautista Rivarola Matto and brought from the Barrero Grande cemetery, nowadays Eusebio Ayala can be seen in one of the yard corners.

It was also through this alley that Juana Maria de Lara went to the Cathedral of Asunción to request Padre Molas for the expected signal: the ringing of the bronze bells, to whose call the Paraguayan came in the morning of May 15 to celebrate the historical moment in which the new Republic of Paraguay was born.