The Grevilles were powerful regionally and nationally. The Fulke Greville who inherited Penkridge in 1606 was a poet and statesman. He served both Elizabeth and James I, who gave him Warwick Castle as a seat and elevated him to the peerage as the 1st Baron Brooke. In 1628 he was murdered by a servant. As he was unmarried and childless, he had adopted his younger cousin Robert as his son and heir to both the title and the great estates in Staffordshire and Warwickshire. Robert was a leading parliamentarian and a Puritan, who promoted emigration to America. When the English Civil War broke out, he took command of a parliamentary army in central England and was killed during the siege of Lichfield Cathedral in 1643. He was succeeded by Francis Greville, 3rd Baron Brooke.