Statistics for occurrence #1 of “Lieut.-Gov. Don Pedro Piernas” in entry united-states-of-america-missouri of Harper's Encyclopedia of United States History:
.........1769
Blanchette, surnamed The Hunter, builds a log-hut on hills now occupied by the city of St. Charles, and establishes a military post under the governor of upper Louisiana......1769
Lieut.-Gov. Don Pedro Piernas arrives at St. Louis to assume the Spanish authority over upper Louisiana......1770
Francisco Crozat succeeds Piernas......1775
Don Ferdinando Leyba appointed governor to succeed Crozat.........
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† This entity has been selected by the automated classifier as the most likely match in this context. It may or may not be the correct match.