| | | Type | Year Published |
| Pérez Sánchez, Dionisio | La condición de la mujer y el poder real en la sociedad visigoda | Journal Article | 1999 |
| Pohlsander, Hans | Helena: Empress and Saint | Book | 1995 |
| Pohlsander, Hans A. | Helena, Heraclius, and the True Cross | Journal Article | 2004 |
| Prinz, Friedrich | Kaiserin Helena (249/50-328/29): Eine Kaiserin und heilige aus der Tiefe der Gesellschaft | Book Section | 2003 |
| Runciman, Steven | Some Notes on the Role of the Empress | Journal Article | 1972 |
| Sauer, Christoph | Echoes from Abroad -- Speeches for the Domestic Audience: Queen Beatrix' Address to the Israeli Parliament | Journal Article | 1996 |
| Schmidt-Sommer, Irmgard | Dunkle Zeiten, helle Wege: Frauen des frühen Mittelalters gestalten Kirche und Welt | Book | 1998 |
| Schuller, Wolfgang | Herrscherinnen der Spätantike | Book Section | 1987 |
| Spieser, J.-M. | Imperatrices Romaines et Chretiennes | Journal Article | 2002 |
| Syson, Luke | Consorts, mistresses and exemplary women: the female medallic portrait in fifteenth-century Italy | Book Section | 1997 |
| Thyret, Isolde | Spiritual Mother of the Realm and Pious Intercessor for the Tsar: The Significance of St. Helena for the Role of the Muscovite Tsaritsa | Conference Proceedings | 1993 |
| Vatchkova, V. | (Saint) Helena of Sofia. The Evolution of the Memory of Saint Constantine's Mother | Book Section | 2016 |
| Vogt, J. | Helena Augusta, das Kreuz und die Juden. Fragen um die Mutter Constantins des Grosen | Journal Article | 1976 |
| Wemple, Suzanne Fonay | Le pouvoir des femmes en Europe occidentale au Xe siècle | Book Section | 1990 |
| Werner, Karl Ferdinand | Les femmes, le pouvoir et la transmission du pouvoir | Book Section | 1990 |
| Whatley, E. Gordon | Constantine the Great, the Empress Helena, and the Relics of the Holy Cross | Book Section | 2000 |
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