Skip to content

Search
Timeline
Map
Graph
Threads
Civilizations
Eras
Random

A living digital encyclopedia of human civilization. Begin anywhere; follow the threads.

¶ Browse

Threads
Civilizations
Eras
Timeline
Map
Graph
Random entry
About

¶ Sources & licensing

Adapted prose from Wikipedia under CC BY-SA 4.0.
1911 Encyclopædia Britannica — public domain in the United States.
Imagery via Wikimedia Commons; per-image attribution on each entry.

¶ Colophon

Set in EB Garamond and JetBrains Mono. Built on Next.js 16 + Postgres 17 with pgvector + Drizzle ORM, deployed to Vercel atop a Neon Postgres branch.

Source at github.com/chloeilabs/alexandria.

Alexandria · MMXXVIExplicit colophon · 2026

Person · 1986 CE

Hélder Castro

Also known as

Helder Castro
Helder Castro
Helder Castro
Hélder Fernando Ferreira Castro
هيلدر كاسترو
هيلدير كاسترو

archival plate · Hélder Castro · placeholder

This entry is a stub. The Library is awakening — a longer account is being written.

Connected to

citizen ofPortugal1139 CE

+ 3 further connections to entries not yet ingested

Hélder Castro · Alexandria