Lusitanic definitions of "Lusitanic" or "Lusitanian" may include medieval-to-modern Galicia, because the Portuguese people and Galician people share close linguistic and cultural ties, including pre-Roman Celtic ones. Modern Portuguese and the Galician language both derive from medieval Galician-Portuguese, and the term is a cultural classification more than a historic–geographical definition. Although, in Ancient Roman times, the Gallaeci were not part of Lusitania province, what became the Galician-Portuguese language developed from Vulgar Latin in Gallaecia, which comprised what is now Galicia, as well as north Portugal, the center of the development of post-Roman Portuguese culture. Later Portuguese use of the name "Lusitania"
RMS Lusitania accused of breaching the internationally recognised Cruiser Rules. It had become more dangerous for submarines to give warning with the British introduction of Q-ships in 1915 with concealed deck guns. ("Lusitania" had been fitted with 6-inch gun mounts in 1913, although she was unarmed at the time of her sinking.) The Germans justified treating "Lusitania" as a naval vessel because she was carrying hundreds of tons of war munitions, therefore making her a legitimate military target, and argued that British merchant ships had violated the Cruiser Rules from the very beginning of the war. The Cruiser Rules were obsolete by