Frequent references have been made by several scholars to the use of Gregory's writings as a ‘mine’ for Byzantine hymnography. The discussions have usually stopped with three or four quick citations of the instances that best exemplify the borrowing. To date there has not been any systematic effort to research the topic in greater detail. This failure is understandable. Such a research presupposes knowledge not only of Gregory's writings, a major task in itself since his works occupy four volumes of PG, but also of Byzantine hymnography which is scattered throughout several volumes used by the Orthodox Church in its daily heortologion. Adding the possibilities that might exist among the mss of Grottaferrata and those that might exist in the Vatican Library, one can easily understand the magnitude of the task and its complexities. This paper attempts a limited but still daunting undertaking: the ferreting out of the borrowings from Gregory by the Byzantine hymnographers whose hymns are still used by the Orthodox Church. Beyond the obvious borrowings by the hymnographers from Gregory lies the insoluble problem of what may be directly borrowed and what indirectly. How can one prove that similarities or even identities in the language denote direct borrowing of one author from another? The complexities of such an investigation notwithstanding, the effort should be made, even on a limited scale, because of the interest and the challenge involved.