Acknowledgements -- Contents -- 1. Introduction -- 2. Koines and koineization -- 2.1. Koine and koines -- 2.2. Models of koineization -- 2.3. Elaborating the process model: Conditions of speaker activity -- 2.4. Observing koineization: The Milton Keynes project -- 2.5. Koineization and other contact phenomena -- 2.6. The model and its use -- 3. The Burgos phase -- 3.1. Social history -- 3.2. Previous discussion of language change in early Castile -- 3.3. Linguistic changes -- 3.4. Conclusion -- 4. The Toledo phase -- 4.1. Social history -- 4.2. Koineization and language spread/dialect leveling -- 4.3. Linguistic changes -- 4.4. Conclusion -- 5. The Seville phase -- 5.1. Social history -- 5.2. Linguistic changes -- 5.3. Conclusion -- 6. Conclusions -- Maps -- Notes -- References -- Index.