Picture: Authors of Menologion of Basil II (circa 985 AC, Constantinople), Byzantine manuscript illuminators[1]: Pantoleon with Georgios, Michael the Younger, Michael of · Public domain · Wikimedia Commons

Vasilissa

Child saint

SaintPre-congregation

Feast: 16 September (not on the universal Roman calendar; kept in the Roman Martyrology or local calendars)

Born

300

Died

309

Beatified

—

not needed: before formal processes

Canonised

By tradition

recognised before formal processes began

Who they were

Vasilissa (300–309) was a Roman Christian girl who is venerated as a child martyr by the Russian Orthodox Church. According to tradition, she was a small child when martyred, suffering in Nicomedia not long after the death of St. Anthimus. The torturers covered her whole body with wounds, but she remained faithful to Jesus Christ.

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

santiebeati.it, 'Basilissa di Nicomedia, Vergine e martire' / Roman Martyrology, 3 September — 'Basilissa di Nicomedia, Vergine e martire, † Nicomedia, Bitinia, circa 309' — the child martyred at Nicomedia shortly after St Anthimus, exactly the person and date range in the entry. The Roman Martyrology keeps her on
Wikidata Q7916763 — dates, feast day and identifiers (CC0)
English Wikipedia — Vasilissa (child martyr) (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.