Rossetti's art was characterised by its sensuality and its medieval revivalism. His early poetry was influenced by John Keats. His later poetry was characterised by the complex interlinking of thought and feeling, especially in his sonnet sequence, ''The House of Life''. Poetry and image are closely entwined in Rossetti's work. He frequently wrote sonnets to accompany his pictures, spanning from ''The Girlhood of Mary Virgin'' (1849) and ''Astarte Syriaca'' (1877), while also creating art to illustrate poems such as ''Goblin Market'' by the celebrated poet Christina Rossetti, his sister.