No, Theodore Beza did not write "the doctrine of grace". It was the Synod of Dort (a synod or council of Reformed Churches) which produced the Canons of Dort in Dordtrecht, in the Netherlands (1618-19), as a rebuttal to Arminianism. The Five Points of TULIP represent these more or less, as they do also the Westminster Confession of Faith (also reflected in the 1689 London Baptist Confession of Faith).Calvin did not write the doctrines of grace, Theodore Beza wrote them in rebuttal to Jacob Arminus' Remonstrances
Disclaimer: Reformed Theology presents a False Gospel, even though some of their theology may be true.