In July 1188 his cousin Alfonso VIII of Castile required the younger Alfonso to recognize the elder as overlord in exchange for recognizing the younger 's authority in León .
ADP PROPN NUM PRON NOUN PROPN PROPN ADP PROPN VERB DET ADJ PROPN PART VERB DET NOUN ADP ADV ADP NOUN ADP VERB DET ADJ PART NOUN ADP PROPN .