Terms for subject Historical containing in the early

English	Russian
as early as in the beginning of the 20th century	ещё в начале XX века (Soulbringer)
in the early modern and modern periods	в новое и новейшее время (Alex_Odeychuk)
in the early modern period	в начале Нового времени (A.Rezvov)
in the early phases of the war	в начальный период войны (Alex_Odeychuk)
in the early 21st century	в начале XXI века (Alex_Odeychuk)
in the early twenty-first century	в начале XXI века (Alex_Odeychuk)
in the medieval and early modern period	в средневековье и раннее новое время (Alex_Odeychuk)
in the medieval and early modern period	средневековья и раннего нового времени (Alex_Odeychuk)