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Sebastião Rodrigues Soromenho

(27 March 1560-c. 1602)

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General referenceInterpretive dossier study · Crown Archives visual atlas
Record originEnglish Wikipedia
Text licenseCC BY-SA 4.0
Source revisionApr 21, 2026
Entity authorityQ1992310 ↗
Source-derived summary

Sebastião Rodrigues Soromenho (Sebastián Rodríguez Cermeño in Spanish; c. 1560–1602), was a Portuguese explorer, born in Sesimbra (Portugal), appointed by King Philip II of Spain (Spanish: Felipe II de España; Portuguese: Filipe I de Portugal) to sail along the shores of California, in the years 1595 and 1596, in order to map the American west coast line and define the maritime routes of the Pacific Ocean in the 16th century.

Early life

Little is known of Soromenho. He was probably the same man as a Sebastian Rodrigues, a pilot on the Manila Galleon Santa Ana, which was captured by Thomas Cavendish in 1587 during his circumnavigation. Soromenho had a 200-ton ship.

Voyage

The Manila galleon San Agustin was sent from the Philippines to survey the coast of what became Oregon and California and then to complete the trip to Acapulco, Mexico. Carrying 130 tons of cargo, the ship displaced approximately 200 tons. Soromenho was appointed as captain for the voyage of the San Agustin based on his professional skill as a navigator.

On July 5, 1595, the San Agustin sailed from Manila with its cargo, some passengers, and some soldiers. On November 4, 1595 it reached land between Point St.

Editorial summary

Begin with the source’s own compact description: “Sebastião Rodrigues Soromenho” is (27 March 1560-c. 1602). The dossier treats that line as a proposition to test through Sebastião, Rodrigues and Soromenho, not as a finished interpretation.

Editorial reviewA concise reference frame for defining the subject, testing terminology and identifying the institution closest to the evidence. The current lead gives the account dated anchors—1560, 1602, 1595, 1596—that can be checked directly. The linked authority record independently contributes the date 1560-03-27. For this dossier, Sebastião, Rodrigues and Soromenho is the immediate research focus.
Editorial analysis

Why this record matters

The phrase “(27 March 1560-c. 1602)” supplies a clear boundary for inquiry. It also exposes the unanswered questions: who defined that boundary, when it became stable and which sources sit outside it.

Evidence profile

Named sources, stable identifiers and responsible institutions provide the strongest route from overview to verifiable evidence. The source revision retrieved here is dated Apr 21, 2026. The linked authority identifier is Q1992310. 1 of 1 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 1560, 1602, 1595 and 1596.

Critical limits

The absence of detail may reflect summary conventions rather than a lack of surviving documentation. The source lead contains qualifying language; that uncertainty should survive quotation, summary and reuse. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.

How to read it

Use the entry as an orientation point, then follow its citations and revision history. Names, dates and institutional relationships should be checked against the original record.

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Source & attribution

This entry incorporates text from “Sebastião Rodrigues Soromenho” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.