Parnas
in the Frankfurt council books he is usually stated as ‘Isaak Aschaffenburg z Einhorn’
House “Einhorn”
He was married 2 or 3 times —
# at least 8 children [birth years roughly deduced; not certain who is from which marriage] >>

1489 Nürnberg — he is mentioned on the List of jewish families present in the synagogue ®46 (p.92/94) on place 47: “Isack, ein Knab, des Mostels Sun”. [so his birthyear can’t be much earlier than 1480]
1490 while the situation of the jewish inhabitants of Nürnberg had become more and more restricted and they all were forbidden to work any longer with gold and silver, only one exception was made for Mosse von Schaffhausen and his family: His sons Maier and Jizchak were permitted to continue their apprenticeship in the Goldsmith trade — cf Ratsbuch ®46 (p.309)
1495 März 12 — Isaac becomes ‘burger’ of Nürnberg replacing his recently deceased brother Maier. — cf Taxbook II ®46 (p87-88) “( Die eltern herren haben Ysaac Mosses von Schafhausen sun an des obgenanten Mairs desselben Mosses gestorben suns stat zu burger haissen schreiben und soll des zinss halben mit ime als mit dem benanten Mair beschehen ist und auch nochmals mit dem [1486] obgenanten Ysrahel von Regenspurg beschicht gehalten werden , also das nach absterben des benanten Mosses die obgenanten Ysaac und Ysrahel 32 guldein nemlich ir yeder 16 guldein statwerung zu gewonlichen zweyen fristen jerlich zinsen sollen ; und Mosse von Schafhausen soll seins yetzaufgenomen suns halben mit bezalung des zinss allererst auf Michaelis schirst antretten , also das er auff Walpurgis schirst nit mer dann 12 fl . und darnach furo zu jeden fristen 20 fl . statwerung geben soll mit geding wie vorsteet . Actum am pfintztag sant Gregorientag anno 95 . ) ( Und Mosse hat 50 guldein landsswerung an der stat pau gegeben , eodem die und 1/2 fl . den losungschreibern . )”
1498 Isaac is mentioned amongst the 16 representants of the jewish community, being on 31.10.1498 summoned in the Townhall’s Courtroom to receive the King’s order that all jewish families were expelled from the town: “Mosse von Schaffhausen, … Isaak Mosse….”, etc ®31(p82/83) — cf

1499 — After Leaving Nürnberg the expelled families wandered from town to town, split up and dispersed.
1515 — [seemingly not married yet] He acquires the “Judenbürgerschaft” in Mainz — together with his father “Mostel” and (2nd?) spouse and also with his brother-in-law “Lasar” ®48 (p.312)
aft ca 1520 he went perhaps indirectly to Aschaffenburg, where most of his children are born
abt 1543 Frankfurt — He is married 2nd (or 3rd) to Blum b’ Jossel z Einhorn and settled in the House of her family.
1550 — He becomes “Vormund” (guardian custodian) of the children of his deceased brother Josef b’ Moshe Goldschmidt mi Schwarzach
1556 — He becomes “Vormund” (guardian custodian) of the children of his deceased own son Josef /Juspa b’ Isak Goldschmidt zu Pfau
He died 21.5.1559. He was buried next to his father [Epidat ®30]. At the well-known Cemetery at the Battonstrasse still is his Tombstone — with the epitaph ®29 ®30:
‎‏אייזק אושנבוריג‏‎
‎‏פה‏‎
‎‏נטמן איש נאמן הפרנס‏‎
‎‏ר׳ יצחק ב״ר משה הלוי ז״ל‏‎
‎‏נפטר ביום השבת ונקבר‏‎
‎‏יום א׳ ט״ו סיון שי״ט לפ״ק‏‎
‎‏תנצב״ה א״ס‏‎
Eisek Aschaffenburg.
Hier ist geborgen ein getreuer Mann, der Vorsteher
Herr Jizchak, Sohn des Herrn Mosche Halevi, sein Andenken zum Segen,
verschieden am Tage des Schabbat und begraben
Tag 1, 15. Sivan 319 nach kleiner Zählung.
Seine Seele sei eingebunden in das Bündel des Lebens, Amen Sela.
[thanks to: http://www.steinheim-institut.de/cgi-bin/epidat?id=ffb-508 ®30]

[The exact relations between some of the first Generations are based upon scarce information and are often worked out in just a reasonable assumption — JG]