Anglo-Israel: Jakob Abbadie (1654–1727)

Anglo-Israel: Jakob Abbadie (1654–1727) was a French protestant minister and author. In 1723 he authored a book titled The Triumph of Providence and Religion and identified the Anglo-Saxon people as being descendants of Israel. In that work he states this:

“Certainly, unless the Ten Tribes have flown into the air, or been plunged to the earth’s centre, they must be sought in that part of the North which, in the time of Constantine, was converted to the Christian Faith – namely among the Iberians, Armenians, and Scythians; for that was the place of their dispersion-the wilderness where God caused them to dwell in tents, as when they came out of the land of Egypt”

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More study material concerning "Who is Israel Today?" by various authors

Dr. Lawrence Blanchard's Covenant Heritage Series of Books
I highly recommend books 1-4. These books are some of the best material on the subject of the covenants and who is Israel.
https://www.yourbiblicalheritage.com/

Dr. Blanchard also has a Bible study course called the Bible Mastery Boot Camp which is based on his books. They are very well put together videos that you follow along with a class room style workbook. I highly recommend this as well.
https://www.yourbiblicalheritage.com/bible-mastery-boot-camp.html

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The following material is by Pastor Sheldon Emry. Although a lot of his material is written in the 1970s, his material on this subject is timeless. He doesn't go into as much detail as Dr. Blanchard's books, but for those that want smaller booklets to read on the subject or to share with others I recommend these.

Abrahamic Covenants - Read for Free
by Pastor Sheldon Emry
https://archive.org/details/AbrahamicCovenants

Heirs of the Promise - Read for Free
by Pastor Sheldon Emry
https://archive.org/details/HeirsOfThePromise_201612

Jesus Christ The Galilean - Read for Free
by Pastor Sheldon Emry
https://archive.org/details/JesusChristTheGalilea..