In 60 AD , Syria included Lebanon .
Adolf Harnack ( Ausbreitung des Christentums , Leipzig , 1902 ) reckons that there were 1,000,000 Jews in Syria ( which included Lebanon ) but the areas east of the Euphrates at the time of Nero in 60 's AD , and 700,000 in Judea , and he allows for an additional 1,500,000 in other places , thus estimating that there were in the first century 4,200,000 Jews in the world .
Historical Jewish population comparisons