 Durán also states that it was during the reign of Moctezuma I, as an invention of Tlacaelel that the flower wars, in which the Aztecs fought Tlaxcala and other Nahuan city-states, were instigated.To strengthen the Aztec nobility, he helped create and enforce sumptuary laws, prohibiting commoners from wearing certain adornments such as lip plugs, gold armbands, and cotton cloaks.He also instigated a policy of burning the books of conquered peoples with the aim of erasing all memories of a pre-Aztec past.