The term "House of Giedroyć" does not correspond to a widely recognized historical dynasty, noble house, or institutional entity in established encyclopedic sources. There is no verifiable documentation in mainstream historical or genealogical references confirming the existence of a formal "House of Giedroyć" as a political or aristocratic entity.
The name "Giedroyć" appears to be a Polish and Lithuanian noble family surname, derived from the Lithuanian princely family "Giedraičiai," which was part of the Lithuanian nobility during the Grand Duchy of Lithuania and later within the Polish–Lithuanian Commonwealth. Members of this family were historically recognized as szlachta (nobility) and bore the title of prince in some branches. However, the collective designation "House of Giedroyć" is not standard in historical literature.
Therefore, while "Giedroyć" may refer to individuals or lineages of noble origin, the term "House of Giedroyć" as a formal or institutional designation lacks sufficient attestation in reliable sources.