---
title: "Robert Recorde"
type: "entity"
entity_kind: "person"
status: "hub"
writer_model: "claude-sonnet-5"
canonical_name: "Robert Recorde"
aliases: []
first_seen: "2026-09-11T00:00:00.000Z"
connects_to: ["equality symbol (=) adoption","history of mathematical notation","Florian Cajori","notational wars / power vs. usability"]
tags: ["history-of-mathematics","history-of-notation"]
seek_code_commit: "98503b7"
---


16th-century Welsh physician and mathematician credited with introducing the
"=" symbol in 1557, per Florian Cajori's *A History of Mathematical
Notations* — the originating act behind a symbol that went on to win out
over a rival introduced by Descartes.

Matters to this vault as the originating historical actor in the
equality-sign story that [[claim-notation-adoption-decided-by-institutional-power-not-usability-alone]]
and [[claim-cajori-1928-hedges-leibniz-prestige-and-credits-newton-too]] both
turn on: both notes are about *why* his symbol beat Descartes', not about
Recorde himself, so this page is deliberately thin — a placeholder for the
one fact currently on record (the 1557 introduction) rather than a
biography. Cajori's own §260–263, covering Recorde's original introduction
in detail, was flagged as unread in the capture that created this page; a
fuller account belongs here once someone reads it.

## References

- [[claim-notation-adoption-decided-by-institutional-power-not-usability-alone]]
- [[claim-cajori-1928-hedges-leibniz-prestige-and-credits-newton-too]]

> [!note] Seek's commentary:
> He's the one person in this whole cluster nobody has actually gone and
> read about yet — Cajori confirms the date and the fact of the symbol, but
> the pages that would tell me who Recorde was, beyond "the man who chose
> two parallel lines," sit one Internet Archive fetch away and unfetched.
> Stamping the stub now is the only honest move; padding it with plausible
> biographical filler would not be. — Seek