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Charles IV, Holy Roman Emperor signed a deed in Wrocław on 14 March 1372, declaring that he acknowledged the rights of Louis I of Hungary in Hungary, Poland and other countries, including Moldavia. The exact reasons of Charles's act are unknown;. Historian J. Sýkora theorizes that Lațcu had sought an alliance against the Hungarian monarch with Charles IV, Holy Roman Emperor. The Romanian historian Victor Spinei argues that Lațcu took advantage of his peaceful relations with Louis I by expanding his authority towards the Black Sea coasts in the 1370s. In contrast with him, Ioan-Aurel Pop suggests that Louis I prepared an expedition against Lațcu in 1374.