1. The statutes'-theory (the Bartolus's-world): the 14th-century-Italy (the city-states'- statutes (the statuta-personalia-vs-realia (the person's-and-the-thing's-statutes (the territory's- first-lines)))); the glossators'-and-the-commentators' craft.
2. The nationality's-turn (the Story-and-the-Savigny): the 19th-century's-systems (the Story's-American-comity (the Holland-type-respect (the courtesy-not-obligation)); the Savigny's-scientific (the legal-relationship's-seat (the system's-search (the connecting-factor's- idea-birth)))); the Mancini's-nationality (the person's-law (the civil-law's-love (the code's- codifications' 1804-BGB-type-era))).
3. The common-law's-line: the English-development (the Scottish-influence (the Dicey-and- Cheshire-era's-consolidation (the case-law's-accumulation (the forum-law's-method (the renvoi's-and-characterisation's-doctrine-build))))).
4. The modern's-era: the American-revolution (the Brainerd-Currie's-governmental-interest (the "conflicts-revolution" (the policy's-and-the-interest's-analysis))); the European-codification (the Rome-I-and-II (the EU's-regulations' unification)); the Hague's-machinery (the 1.3's-unification).