Flag of Palau de Santa Eulàlia (Girona, Catalonia, Spain).
Yellow flag with a red saltire, as wide as 1/9 of the flag's height, with yellow and black fimbriations each as wide as 1/18 of the flag's height. Ratio 2:3. (Source: http://flagspot.net/flags/es-gi-pe.html)
Own work
Mutari