The Zagreb Classical Gymnasium Society (DZKG) and HGZD cherish fruitful cooperation for a number of years, since the time when HGZD held its regular Tribunes in the “Classicians” premises. It is a custom that HGZD annually, usually in spring, hold a lecture with heraldic and vexillological topics for the Classical auditorium. This year, on 24 February the 12th lecture was held by Dr. Heimer, HGZD president, with the topic chosen by the hosts, on Spanish flags recently given in the cycle Flags of Eurpean and World Countries.