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In page Surname:
"Only during the Early Modern Age, lower-class males started to use at least one surname; married lower-class women usually took up their spouse's surname, since they rarely ever used one beforehand. After the 1755 Lisbon earthquake, Portuguese authorities realized the benefits of enforcing the use and registry of surnames. Henceforth, they became mandatory, although the rules for their use were very liberal.[citation needed]
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