NICEPHORUS, Calistus, a learned monk of Constantinople, who flourished in the fourteenth century, under the Emperor Andronicus Palaeologus the elder. He wrote in Greek an ecclesiastical history in twenty-three books, eighteen of which are still extant, and contain the transactions of the church from the birth of Christ till the death of the Emperor Phocas in the year 610. Of the other five books we have nothing but the arguments, which show that they embraced the portion extending from the commencement of the reign of the Emperor Heraclius to the end of that of Leo the Philosopher, who died in the year 911. This history was dedicated to Andronicus Palaeologus the elder; it was translated into Latin by John Langius, and has gone through several editions, the best of which is that of Paris, published in 1630.