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Summerson, Henry. "Clifford, Robert, first Lord Clifford (1274–1314), soldier an...
Full citation
Summerson, Henry. "Clifford, Robert, first Lord Clifford (1274–1314), soldier and magnate" in Oxford Dictionary of National Biography. October 3 2013, Oxford University Press. Accessed online 15 Apr 2020 with subscription at ODNB.