The son of Thomas Halliwell, he was born in London and was educated privately and at Jesus College, Cambridge. He devoted himself to antiquarian research, particularly into early English literature. In 1839 he edited Sir John Mandeville's Travels; in 1842 published an Account of the European manuscripts in the Chetham Library, besides a newly discovered metrical romance of the 18th century (Torrent of Portugal). He became best known, however, as a Shakespearean editor and collector. In 1848 he brought out his Life of Shakespeare, which passed through several editions; in 1853-1865 a sumptuous edition, limited to 150 copies, of Shakespeare in folio, with full critical notes; in 1863 a Calendar of the Records at Stratford-on-Awn; in 1864 a History of New Place.
After 1870 he entirely gave up textual criticism, and devoted his attention to elucidating the particulars of Shakespeare's life. He collated all the available facts and documents in relation to it, and exhausted the information to be found in local records in his Outlines of the Life of Shakespeare. He was mainly instrumental in the purchase of New Place for the corporation of Stratford-on-Avon, and in the formation there of the Shakespeare museum.
His publications in all numbered more than sixty volumes. He assumed the name of Phillipps in 1872, under the will of the grandfather of his first wife, a daughter of Sir Thomas Phillipps the antiquary. He took an active interest in the Camden Society, the Percy Society and the Shakespeare Society, for which he edited many early English and Elizabethan works. From 1845 Halliwell was excluded from the library of the British Museum on account of the suspicion attaching to his possession of some manuscripts which had been removed from the library of Trinity College, Cambridge. He published privately an explanation of the matter in 1845.
His house, Hollingbury Copse, near Brighton, was full of rare and curious works, and he generously gave many of them to the Chetham library, Manchester, to the town library of Penzance, to the Smithsonian Institution, and to the library of the University of Edinburgh.
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