The name and design of the flag is in the theory advocated by several authors[4] of a relationship between the genesis of labarum and the military standard called Cantabrum, thereby identifying both as a same thing; and the alleged relationship the Codex Theodosianus established between the Labarum and the Cantabrarii, the school of Roman soldiers in charge of carrying the Cantabrum.

Additionally, and according to the definition of the Royal Academy of the Spanish language, labarum is the Roman standard (as in military ceremonial flag) on which, under Emperor Constantine's rule, the cross and the Monogram of Christ (Chi-Rho) was drawn.

Etymologically, the word comes from (p)lab- which means to speak in a number of Celtic languages, many of which have derivatives.

[5] The plenary session of the Parliament of Cantabria, at its meeting of March 14 2016, approved a resolution as a result of the processing of the non-legislative proposal No.

Urges the institutions and civil society of Cantabria to actively promote and participate in their knowledge and dissemination as an iconographic expression of the identity of the Cantabrian people.