Coat of arms of Isabella of Spain (1851–1931), as Spanish Infanta (Princess), external ornaments as widow. (1880-1931)It was also the arms of Widow Infantas with the Order of Ladies of Queen Maria Luisa. Isabella was widow most of the time:

Infanta Luisa Fernanda of Spain (1890-1897)
Infanta Eulalia of Spain (1931-1958)
Avilés, José de Avilés, Marqués de (1780). Ciencia heroyca, reducida a las leyes heráldicas del blasón, Madrid: J. Ibarra, (Madrid: Bitácora, 1992). T. 2, p. 98-100. ISBN 84-465-0006-X.  [1] and [2]
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