collecting taxes from them or creating a knights' association, but an ideology or frame emerged, that allowed the knights to retain their freedom while fostering the relationship between the crown and the sword. Maximilian had a great passion for armour, not only as equipment for battle or tournaments, but as an art form. He prided himself on his armor designing expertise and knowledge of metallurgy. Under his patronage, "the art of the armorer blossomed like never before." Master armorers across Europe like Lorenz Helmschmid, Konrad Seusenhofer, Franck Scroo and Daniel Hopfer (who was the first to etch on iron as part of an artistic process, using an acid wash) created custom-made armors that often served as extravagant gifts to display Maximilian's generosity and devices that would produce special effects (often initiated by the emperor himself) in tournaments. The style of armour that became popular during the second half of his reign featured elaborate fluting and metalworking, and became known as Maximilian armour. It emphasized the details in the shaping of the metal itself, rather than the etched or gilded designs popular in the Milanese style. Maximilian also gave a bizarre jousting helmet as a gift to King Henry VIII – the helmet's visor features a human face, with eyes, nose and a grinning mouth, and was modelled after the appearance of Maximilian himself. It also sports a pair of curled ram's horns, brass spectacles, and even etched beard stubble. Knowing that the extinct Treizsaurbeyn (likely Treitzsauerwein) family had a method to make extra tough armours that could not be shot through by any crossbow, he sought their servant Caspar Riederer, who helped Konrad Seusenhofer to recreate the armour type. With knowledge gained from Riederer, Maximilian invented a method "so that in his workshops 30 front and back plates could be made at once", in order to help his soldiers and especially his Landsknechte. The details of the process described are currently not known, but likely utilizing matrices with where armour parts could be stamped out from sheet metal. Maximilian associated the practical art of hunting (as well as fishing and falconry) with his status as prince and knight. He introduced parforce and park hunting to Germany. He also published essays on these topics. In this he followed Frederick II Hohenstaufen and was equally attentive to naturalist details but less scientific. His Tyrol Fishery Book (Tiroler Fischereibuch) was composed with the