Here are some of his notable works:
* "A History of the Inquisition of the Middle Ages" (1888): A groundbreaking and influential work that examines the history of the Inquisition, analyzing its origins, practices, and impact.
* "The Moriscos of Spain: Their Conversion and Expulsion" (1901): A study of the forced conversions of Spanish Muslims (Moriscos) and their eventual expulsion from Spain in the 17th century.
* "History of the Inquisition of Spain" (4 vols, 1906-1907): A comprehensive account of the Spanish Inquisition, focusing on its role in the consolidation of Spanish power and its impact on Spanish society.
* "The Sacerdotal Celibacy in the Christian Church" (1907): An exploration of the historical development and social implications of clerical celibacy in Christianity.
Lea's works are characterized by their meticulous research, clear prose, and critical analysis. He challenged traditional interpretations of church history and was considered a pioneer in the study of medieval and early modern history.
It's important to note that there might be other authors with similar names, but Henry Charles Lea is the most well-known historian with a similar name.