Did you ever wonder before where jews--persecuted by medieval Britons and early modern continental sectarians during the Reconquista, Inquisition, and 30 Years War--migrated?

Generally, contemporary histiographers identify members of the diaspora by last-known, ie. documented, territorial origin, eg. sefarad (Iberia), ashkenazim ("Rhineland," "France," "slavic" frontiers). By documented, amateur and experts researchers generally have relied on family and government records such as marriage and birth certificates; scientific racists ("eugenicists") claim a purity test said to isolate a set of alleles that can distinguish all ashkenazim among jews, anywhere, anytime.

Perhaps the government of Portugal has in its possession Abramovitch's DNA? If not an acceptable, thorough ancestal record of his family's "self-identified" Iberian origin story.

Being a descendent of US American slaves, I can appreciate how difficult it is to preserve, discover, or recover documentary evidence which corroborates ancestry, or lineage--whether for purposes of legal claims or private satisfaction. Regarding, genocidal purges and their consequences, I would recommend you watching an RT documentary "The ones who search" (2020), but sadly, because of the "world war" effort to vanquish PUTIN, it's now unavailable. It starts as orphan Enrique's 20-year post-Franco "truth and reconciliation" journey and ends with him discovering 16th century "morisco" family artifacts in far-flung provincial records.

"Archeology of Knowledge" is full of surprises.

Ashkenazi Jews Find Spanish, Portuguese Roots After Passport Offer to Descendants of Expelled, 2019

It turns out quite a few Ashkenazi Jews, even those who thought they had 'pure'[?] Polish blood [?], might be able to be recognized as descendants of those expelled from Spain
[...]
Oren Gruber from Rishon Letzion looked for his wife's last name on the list. Her family is from Morocco [!] - one of the main countries where Spanish [!] Jews immigrated to after the expulsion in 1492. During his search he was surprised to find his Ashkenazi [!] grandmother's last name too: Efrati. "When I asked my father to explain, he said it was known that the family of my grandmother, who was born in Ukraine [!], has Spanish roots," Gruber told Haaretz.
[...]
Many Spanish Jews left for Portugal in 1492, before they were expelled from there too in 1497. This approval is the last station before receiving the passport issued by the Portuguese government. "It turns out that Sephardim are hiding in Ashkenazi lands, too," said Gruber this week with a smile.