⟨u⟩ and ⟨v⟩ were not considered two distinct letters then but as still different forms of the same letter. Typographically, ⟨v⟩ was frequent at the start of a word and ⟨u⟩ elsewhere: hence vnmoued (for modern unmoved) and loue (for love). The modern convention of using ⟨u⟩ for the vowel sounds and ⟨v⟩ for the consonant appears to have been introduced in the 1630s. Also, ⟨w⟩ was frequently represented by ⟨vv⟩.

Source: Wikipedia