The Shelleys moved between various Italian cities during these years; in later 1818 they were living in Florence , in a pensione on the Via Valfonda. This street now runs alongside Florence's railway station, and the building now on the site, the original having been destroyed in World War II, carries a plaque recording the poet's stay. Here they received two visitors, a Miss Sophia Stacey and her much older travelling companion, Miss Corbet Parry-Jones (to be described by Mary as "an ignorant little Welshwoman"). Sophia had for three years in her youth been ward of the poet's aunt and uncle. The pair moved into the same pensione and stayed for about two months. During this period Mary gave birth to another son; Sophia is credited with suggesting that he be named after the city of his birth, so he became Percy Florence Shelley , later Sir Percy. Shelley also wrote his "Ode to Sophia Stacey" during this time. They then moved to Pisa, largely at the suggestion of its resident Margaret King , who, as a former pupil of Mary Wollstonecraft, took a maternal interest in the younger Mary and her companions. This "no nonsense grande dame "  and her common-law husband George William Tighe inspired the poet with "a new-found sense of radicalism". Tighe was an agricultural theorist, and provided the younger man with a great deal of material on chemistry, biology and statistics. 
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In addition to the developmental and natural state theories introduced in the novel, there are also four literary and historical works that Mary Shelley read and studied between the time that she eloped with Percy in 1814 and the publication of Frankenstein in 1818, that were of primary importance in the creation of this novel. They are as follows; Paradise Lost by John Milton, The Sorrows of Young Werther by Goethe, Lives by Plutarch, and The Memoirs of the Author of the Rights of Women by William Godwin. The first three assist in the monster’s education and understanding of human society, which will be discussed shortly. First, however I will discuss the Memoirs as related to the monster’s discovery of Victor Frankenstein’s journal, and how the journal and Memoirs relate to Mary Shelley’s and the monster’s search for the knowledge of who they are.