The Papal Navy, Volume VI: Marcantonio Colonna at Lepanto, 1570-1573. This bilingual Warships & Navies edition preserves 451 original-language facsimile pages from Storia della marina pontificia, then frames the volume in English for collectors, researchers, and naval-history readers. This volume restores an important segment of Storia della marina pontificia, one of the major documentary works in non-English naval historiography. It also provides scholarly back-of-book indexes of persons, places, events, and ships, turning the facsimile into a practical research tool for tracing actors, theaters, campaigns, and vessels. This edition also includes Most Important Passages Translated, a curated set of twenty substantial excerpts rendered into modern English with a trace of period flavor, so readers can enter Storia della marina pontificia through its decisive scenes, arguments, and descriptions before or alongside the facsimile. The Papal Navy, Volume VI, drawn from Storia della marina pontificia, is worth keeping in circulation because it preserves a serious documentary treatment of the Lepanto campaign and the fusion of galley warfare, alliance politics, and Catholic military prestige. In English-language publishing, that territory is still thinly held. Important works survive in library scans or specialist reference lists, yet remain practically invisible to the broader circle of readers who would value them. This edition exists to close that gap without flattening the original book into a modern paraphrase. We expect the book to matter most to collectors of Mediterranean naval history, scholars of crusade and church-state politics, and readers interested in overlooked maritime institutions. For that readership, the attraction is not novelty for its own sake but access to a work that still carries archival density, historiographical personality, and shelf-worthy physical presence. The value of a facsimile classic lies in the encounter with the book as book: its original language, pacing, typography, and sense of documentary weight. That encounter is part of the intellectual experience, not an obstacle to it. Our editorial choices follow that principle. The facsimile core remains intact in the original language and preserves approximately 451 source pages. Instead of substituting reset translation, we add English framing matter that helps the reader understand what kind of work this is, where it sits in naval history, and how to move through it intelligently. The goal is guidance, not replacement: enough apparatus to open the book, but not so much intervention that the source disappears.