Skip to the content
Person

Rosemary Theby

Rosemary Theresa Theby (born Rose Masing, April 8, 1892 – November 10, 1973) was an American film actress. She appeared in some 250 films between 1911 and 1940.

Also recorded as Rosemary Theresa Theby

Rosemary Theby

Advertisement for the American western film Rio Grande (1920) with Rosemary Theby and Allan Sears, on pages 3962 and 3963 of the May 1, 1920 Motion Picture News.

Edwin Carewe Productions / Pathé Distributors · Motion Picture News (Mar - Jun 1920) at the Internet Archive · Public domain

Name
Rosemary Theby
Birth Name
Rose Masing
Born
8 April 1892
Birthplace
St.
Died
10 November 1973
Place of death
Los Angeles, California, U.S.
Occupation
Actress

VALÉORINE Encyclopedia

VALÉORINE documentary reading

Documentary summary

Rosemary Theresa Theby (born Rose Masing, April 8, 1892 – November 10, 1973) was an American film actress. She appeared in some 250 films between 1911 and 1940.

Admitted source layer · organised and presented by VALÉORINE

Reference Check

Propose documentary evidence for Rosemary Theby. A contribution is never written directly as fact: identity, source, rights and evidence gates still decide.

Sign in to contribute

Documentary evidence

Documentary basis

Authority files

wikidata · Q3442516 · wikipedia · Rosemary Theby

In this article

  1. 01Biography
  2. 02Notes, references and evidence

The Encyclopedia exists whether or not anything is for sale. Corrections are recorded rather than overwritten, and every version of this record is kept. Published 19 August 2026.

Elsewhere in Film memorabilia

For owners

Own a work by Rosemary Theby?

A specialist will read what you send and tell you what the house can establish, what it cannot, and whether the object is suited to sale. There is no charge and no obligation. The object stays with you throughout; nothing is shipped to us unless it is arranged in writing beforehand.