In the period of the Renaissance, trade became a matter of legislation and policy. Municipal governments and princes aimed to facilitate trade. International trade relations became increasingly supervised by states. This came in tandem with more treaties. From the middle of the fifteenth century onwards, specialized institutions were created and they increased control over foreign merchants. As a result of growing government intervention, the rules relating to trade were found in bylaws, charters and statutes. Besides those there were customs of trade, which were mostly local. New mercantile techniques, becoming widespread in this period, were maritime insurance, bills of exchange and partnerships of merchants. Insolvency became regulated in the sixteenth century. From the 1500s onwards, rights of hospitality for traders and a right of trade were developed in ius gentium writings. However, due to the mostly local customs and legislation, trade across European countries was far from harmonised. Gerald Malynes proposed a universal custom of trade, but he struggled with the combination of ius gentium ideas with the more factual customs of trade. His views nonetheless laid the basis for later categorisations of commercial law as being customary and transnational.