1492: The Iberian Expulsion and Sephardic Merchant Diaspora

The Alhambra Decree, issued by Ferdinand and Isabella on March 31, 1492, ordered the expulsion of practicing Jews from the kingdoms of Castile and Aragon by July 31, 1492. The Portuguese expulsion followed in 1497. The combined Iberian expulsions produced one of the most consequential commercial diasporas in modern history — and one whose institutional patterns continue to shape the global Sephardic commercial economy nearly five and a half centuries later.

This article is institutional and historical reporting on a documented commercial history, anchored in established academic scholarship.

The Iberian commercial position before 1492

Jewish commercial activity in medieval Spain operated across textiles, finance, tax-farming, long-distance trade, and the administrative apparatus of the late Iberian Christian kingdoms. The Sephardic Jewish merchant class had operated for centuries within the cross-Mediterranean commercial network that connected Iberia to the broader Mediterranean trading system, including substantial commercial activity in North Africa (Fez, Tangier, Tlemcen), the Italian commercial centers (Genoa, Venice, Florence), and the Ottoman territories.

The Reconquista — the centuries-long Christian re-conquest of the Iberian peninsula from Muslim rule — culminated in the 1492 fall of Granada (the last remaining Muslim Iberian polity). The Alhambra Decree was issued within three months of the Granada conquest.

The expulsion mechanics

Per multiple academic histories, including Yosef Yerushalmi's foundational work on the period and Jonathan Israel's documentation of the subsequent Western Sephardic diaspora, the 1492 expulsion forced approximately 100,000-200,000 Iberian Jews to choose between conversion to Christianity (becoming conversos or "New Christians"), emigration, or covert continuation of Jewish practice. The 1497 Portuguese expulsion produced parallel dynamics.

The expelled population dispersed across multiple geographies in waves through the late 1400s and early 1500s.

The Ottoman absorption

The largest single absorbing geography was the Ottoman Empire. Sultan Bayezid II famously welcomed Sephardic refugees into Ottoman territory, where they established substantial commercial communities across Salonika, Constantinople, Smyrna, Sarajevo, and the broader Ottoman urban network.

Salonika in particular operated as a majority-Sephardic city through much of the 19th century, with extensive textile, port, and trading commerce documented across academic literature including the work of Aron Rodrigue.

The North African continuation

Major Sephardic merchant communities continued and expanded across North Africa. Fez, Tangier, Tlemcen, Algiers, Tunis, and Tripoli all absorbed Sephardic merchant families. Daniel Schroeter's academic work has documented Moroccan Jewish commerce of the post-1492 period in particular detail.

The Western European chapter

A subset of Sephardic merchant families migrated to the Low Countries, particularly Amsterdam, and to Hamburg, Bordeaux, and Bayonne. Many of these families had operated as conversos in Iberia and openly returned to Jewish practice in the more permissive Dutch and German Protestant environments of the late 1500s and 1600s.

The Amsterdam Sephardic community became the institutional anchor of what Jonathan Israel and others have documented as the "Sephardic Atlantic" — the merchant network that operated through the 17th century from Amsterdam, London, and the major commercial centers of Western Europe across the Atlantic into Recife, Curaçao, New Amsterdam (later New York), and the broader Caribbean.

The Americas extension

The Sephardic Atlantic produced the earliest documented Jewish commercial presence in the Americas. The brief Sephardic presence in Dutch Brazil (Recife, 1630-1654), the subsequent dispersion to Curaçao following the Portuguese reconquest of Recife, and the establishment of New Amsterdam Sephardic commercial activity (the Sephardic community that became Shearith Israel Synagogue in New York) shaped the early Jewish commercial presence in the broader Americas.

The London Sephardic community — anchored by Bevis Marks Synagogue, founded 1701 — operated as the institutional center of the English-speaking Western Sephardic commercial network.

The continued institutional pattern

The 1492 commercial dispersal established institutional patterns that recur across the historical Sephardic and Mizrahi commercial economy.

Multi-jurisdictional family operation. Sephardic merchant families operated across multiple jurisdictions simultaneously, with branch operations, family-member commercial relationships, and information networks spanning the Mediterranean, the Atlantic, and (later) the Indian Ocean and Pacific.

Religious-institutional infrastructure operating alongside commerce. The Sephardic congregation, the burial society, the educational institutions, and the broader communal infrastructure operated alongside commercial activity as a structural feature of Sephardic urban presence.

Trading-house family organization. Diversified family enterprises spanning multiple commodity and service categories anchored the typical Sephardic commercial operation.

The historical continuity

The institutional patterns established by the 1492 dispersal trace forward through subsequent centuries. The Iraqi-Indian-Shanghai trading houses of the 18th-20th centuries, the 19th-century Egyptian Jewish commercial economy of Cairo and Alexandria, the Aleppo and Damascus Syrian Jewish commercial communities (whose descendants now operate substantial business activity in Brooklyn, Mexico City, Panama City, and São Paulo), and the broader Sephardic and Mizrahi commercial diaspora all share institutional DNA traceable to the post-1492 dispersal patterns.

The academic literature on the period is rich — Yerushalmi, Jonathan Israel, Schroeter, Sarah Abrevaya Stein, Aron Rodrigue, Maisie Meyer, Chiara Betta, and a substantial scholarly body cover this material at academic depth. Structured English-language business writing has largely not connected to it.

The Olam covers it because it is well-documented, intrinsically significant, and structurally connected to the modern commercial economy.

1492: The Sephardic Merchant Diaspora