+———Earl van Derwerker (1890 – 1947)  |      Earl van Derwerker   |                                                                                      |                                                                               +———Ioannes Langmann (abt 980 Lucca, Tuscany – )  |                                                                               |  |                                                                           +———Abt 6 Generation Langmann  |                                                                           |  |                                                                       +———Langmann (bef 1200 Nurnberg, Germany – )  |                                                                       |  |                                                                   +———Nurnberg Bürgermeister Langmann (abt 1200 Nürnberg – )  |                                                                   |  |                                                               +———Kurt (Conrad) Langmann (abt 1240 Nurnberg, ment. 1282/1318 – aft 1318)  |                                                               |  |                                                           +———Hans Langmann (abt 1280 died in Livland, Riga, aft 1330 – aft 1357)  |                                                           |  |                                                       +———Heinrich Nicolaus de Langmann (1323 Rostock, Mecklenburg – 1393 Lubeck, Schleswig-Holstein)  |                                                       |  |                                                   +———Peter (Pueri) Langmann (abt 1360 ment. 1392/98, Rostock – )  |                                                   |   |      |                                                   |   +———Nn  |                                                   |  |                                               +———Court Chaplain Nicolaus de Langmann (abt 1410 1451/ Portugal, Wiener-Neustadt – )  |                                               |  |                                           +———Imp. Chancellor Joachim Langmann (bef 1450 Neuburg, Bavaria – )  |                                           |   |      |                                           |   +———Nn Agnes? von Falkenstein  |                                           |  |                                       +———Rostock Burgermeister Heinrich Langmann (abt 1480 Rostock – )  |                                       |   |      |                                       |   +———Hedwig von Seidlitz  |                                       |  |                                   +———Dean/Wismar Nicolaus Langmann (abt 1530 Wismar – )  |                                   |   |      |                                   |   +———Marie von Blumenthal (abt 1480 – )  |                                   |  |                               +———Joachim Langmann (abt 1560 Wittenburg, Germany – )  |                               |   |      |                               |   +———Gertrud Kiekebusch (abt 1520 – )  |                               |  |                           +———Bartholomaus Langmann (abt 1604 poss. in Damensis, Demern/Demmin, Damm b/Rostock?, Pommern – bef 1677 Gross Quassow, Mecklenburg, Germany)  |                           |   |      |                           |   +———Margaretha Duetzenrath (abt 1560 Lüneburg – )  |                           |  |                       +———Bartholomaus (of Leussow) Langmann (4 Jan 1648 Gross Quassow, Mecklenburg, Germany – abt 1684 Gross Quassow, Mecklenburg, Germany)  |                       |   |      |                       |   +———Maria Beyer (18 May 1614 Koenigsberg, Neumark, Brandenburg – 28 Apr 1667 Gross Quassow, Mecklenburg, Germany)  |                       |  |                   +———Andreas Langmann (4 Apr 1681 Gross Quassow, Mecklenburg, Germany – )  |                   |   |      |                   |   +———Catharina Meltz (1643/4 – 18 Feb 1698)  |                   |  |               +———Deacon Andreas Langmann (2 Jul 1719 Wesenberg, Mecklenburg, Germany – 20 Sep 1781 Sponholz, Mecklenburg, Germany)  |               |   |      |               |   +———Maria Schurlein (6 May 1692 poss. in Mosbach or Asch, Bayern, Germany – 7 Mar 1724 Wesenberg, Mecklenburg, Germany)  |               |  |           +———Cleric Karl Ludwig Caspar Langmann (26 Apr 1767 Sponholz, Mecklenburg, Germany – 14 Oct 1836 Sponholz, Mecklenburg, Germany)  |           |   |      |           |   +———Christina Behm  |           |  |       +———H. School Pricip. Johann Friedrich Christoph Langmann (21 May 1802 Matzdorf, Mecklenburg, Germany – 27 May 1870 Neustrelitz, Mecklenburg, Germany)  |       |   |      |       |   +———Catharina Maria (Sophie) Scheeren (1766 Ihlenfeld, Mecklenburg, Germany – 18 Dec 1847 Matzdorf, Mecklenburg, Germany)  |       |  |   +———M. D. Gustav Langmann (21 Dec 1842 – 1916 New York, USA)  |   |   |      |   |   +———Emilie Ottilie Lisette Drews (27 Apr 1815 Krickow, Mecklenburg, Germany – 11 Oct 1891 Neustrelitz, Mecklenburg, Germany)  |   |  +———Emily Helen Langmann (Dec 1896 – )      |          +———Cathy Zinser (1858 – 1931)