⟨u⟩ and ⟨v⟩ were not yet considered two distinct letters, but different forms of the same letter. Typographically, ⟨v⟩ was frequently used at the start of a word and ⟨u⟩ elsewhere. The modern convention of using ⟨u⟩ for the vowel sound(s) and ⟨v⟩ for the consonant appears to have been introduced in the 1630s. Also, ⟨w⟩ was frequently represented by ⟨vv⟩.