About Pedro Piernas
Born 1750. Pedro Piernas was a Spanish colonial administrator.
Pedro Joseph Piernas was a Spanish military official who rose to the rank of commandant in 1768 and served as Lieutenant governor of Illinois between 1770 and 1775.
Biography
In 1747, Pedro Piernas is believed to have joined the Spanish Army and he probably obtained the ranks of infantry captain, colonel, commandant, and lieutenant.
Piernas had already ruled Upper Louisiana in 1768, but he arrived in Saint Louis on March 10, 1769 . In August of that year, he was appointed Lieutenant Governor of Illinois by Alejandro O'Reilly. The French commandant of the village, Louis Groston de Saint-Ange de Bellerive, transferred formal control to Piernas on May 20, 1770. St. Ange was then named assistant to Piernas and special adviser on Amerindian affairs. Piernas also made St. Ange an infantry captain in the service of the Spanish Crown and maintained friendly relations with him. After the transfer, Piernas confirmed St. Ange's and Laclède's land grants. He rented Laclède's headquarters as government offices, with Spanish soldiers providing local security. Piernas also sent soldiers up the river with wampum (shell beads used as a native money for the Eastern Woodlands tribes) belts to enlist the aid of the chiefs against the American interlopers.
Unlike the French, who respected and traded with local Amerindians, Piernas was standoffish and less diplomatic. In 1773, he invited a Shawnee chief to St. Louis to sign a treaty. It was designed to create a barrier between St. Louis and the tribes near Ste Genevieve. His followers, who were all dressed in their traditional clothing, accompanied the chief. After a series of threats, an Osage warrior was called upon to fight against Piernas, who imprisoned the Shawnee chief.
In 1774, a small prison was built by Piernas against the stone structure that Laclede had originally built as the headquarters of trade and as his residence. He also built a small chapel to replace the tent that was formally used for services and encourage a Capuchin friar, Father Valentin, to live in the village as their primary resident priest. His friend and aide, Benito Vasquez, provided a new bell in Piernas’honor for the new church, dubbed "Pierre Joseph congratulated."
Piernas left office as Lieutenant Governor of Illinois in 1775, being replaced by Colonel Francisco Cruzat.
Personal life
Piernas married a French woman named Portneuf, which may have also contributed to his popularity with the French residents of the colony. Their house was one of the first built in St. Louis.
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Important facts
Frequently asked questions
Who was Pedro Piernas?
Spanish military colonial governor
When was Pedro Piernas born?
Pedro Piernas was born in 1750.
What was Pedro Piernas's occupation?
Pedro Piernas was a colonial administrator.
What nationality was Pedro Piernas?
Pedro Piernas was Spanish.
Sources & further reading
Cite this page
APA: Biography.guide. (2026). Pedro Piernas. https://biography.guide/pedro-piernas/
MLA: "Pedro Piernas." Biography.guide, https://biography.guide/pedro-piernas/.
Chicago: "Pedro Piernas." Biography.guide. https://biography.guide/pedro-piernas/.
Data last updated: 2026-09-20 · Spot an error? Report a correction.
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