Question

Romantic poet who transformed a sequence of 14-line units into an ode is

Answer 1

John Keats was the poet

Answer 2

There are great poets who made 14 line verse into an Ode. These 14 line verse poems are termed as "Sonnet".

Poets like Shakespeare, Alexander Pope, John Donne, E.E.Cummings, etc.

Ode is otherwise called as addressing to something (nature, character or  or to someone).

However romantic odes are mostly from John Keats.

His odes are Ode to Gracian Urn, Ode to Autumn.