Picture: 柯達理 · CC BY-SA 3.0 · Wikimedia Commons

Saint Arthur

putative saint and martyr

SaintBenedictinesPre-congregation

Feast: 15 November (not on the universal Roman calendar; kept in the Roman Martyrology or local calendars)

Born

1450

Died

1539

Beatified

—

not needed: before formal processes

Canonised

By tradition

recognised before formal processes began

Who they were

Arthur of Glastonbury (c. 1539), according to some French sources, was an English Catholic in the sixteenth century. He was martyred during the period of King Henry VIII's suppression of the Catholic Church due to his refusal to accept the king's claim to spiritual leadership of the Church in England.

Summary from Wikipedia (CC BY-SA 4.0), until this page is written up in full.

The miracles

Limited information is available on this saint so far.

Why that counted as sanctity

Limited information is available on this saint so far.

Sources

Nominis (French Bishops' Conference) - Bienheureux Jean Thorne, martyr — "Benedictin de Glastonbury, Arthur de son nom de religion" (+1539), hanged with Abbot Richard Whiting; beatified 1895, kept with the English martyrs on 15 November.
Wikidata Q4070328 — dates, feast day and identifiers (CC0)
English Wikipedia — Arthur of Glastonbury (CC BY-SA)

Not yet written up in full. The Catholic source above names this person; the name, dates and step come from Wikidata and are not yet checked against Church records.