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Most systems assign identifiers relative to a focal person and are oriented towards Ancestors (an ascending system) or Descendants (a descending system).
The terminology used to refer to this focal person varies, including: subject, proband (from psychiatry & medical genetics; proposito for male proband or proposita for female proband), root node (graphing), progenitor/primogenitor (for descending genealogical numbering systems), de cujus (Latin term meaning 'about which').
==Simple numbering==
* {{man menu|Reports ->Text Reports -> [[Gramps_{{Version manual}}_Wiki_Manual_-_Reports_-_part_6#Descendant_Report|Descendant Report]]...}}
[[File:TextReports-DescendantReport-example-overview-50.png|thumb|right|450px|Fig. {{#var:chapter}}.{{#vardefineecho:figure|{{#expr:{{#var:figure}}+1}}}} Descendant Report - descending generation numbering using [[Example.gramps|Example.gramps]]]]
{{-}}<span id="ahnentafel">
==Ahnentafel==
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An ascending system for numbering pedigree ancestors starting with '1' at a focal person. The number of the father is double that of the child. The mother is double the childcare child's number plus one. [[File:Ahnentafel_Example.png|frame|left|450px|Fig. {{#var:chapter}}.{{#vardefineecho:figure|{{#expr:{{#var:figure}}+1}}}} Ahnentafel Report - ascending numbering focused on '''''Jennie S. Garner''''' of [[Example.gramps|Example.gramps]]]]{{-}}
====Origin====
An Austrian nobleman, diplomat, historian, and publicist named [https://en.m.wikipedia.org/wiki/Micha%C3%ABl_Eytzinger Michaël Eytzinger] (circa 1530-1598) introduced a new functional theory of numeration of ancestors in 1590 with the Cologne publication of the ''[https://books.google.com/books/about/Thesaurus_principum_hac_aetate_in_Europa.html?id=Hzc8AAAAcAAJ Thesaurus principum hac aetate in Europa viventium]'' ("lexicon of officials in this age in Europe living"). The Ahnentafel (German for "ancestor table") was first illustrated with a 5 generation pedigree of [https://en.m.wikipedia.org/wiki/Henry_III_of_France Henry III of France] on pages 146 and 147.
* {{man menu|Reports ->Graphs -> [[Gramps_{{Version manual}}_Wiki_Manual_-_Reports_-_part_5#Hourglass_Graph|Hourglass Graph]]...}}
* {{man menu|Reports ->Text Reports -> [[Gramps_{{Version manual}}_Wiki_Manual_-_Reports_-_part_6#Detailed_Ancestral_Report|Detailed Ancestral Report]]...}}
* {{man menu|Reports ->Text Reports -> [[Gramps_{{Version manual}}_Wiki_Manual_-_Reports_-_part_6#Ahnentafel_Report|Ahnentafel Report]]...}}• [[Specification:Ahnentafel_Report|Specification]] (2007)
====External Links====
==Development Resources==
* Add a 'numbering' data class - Gramps feature request {{bug|0004169}}
* [[PseudonymTree.gramps]] - example (gzip compressed) multi-generational Gramps format Tree that uses intuitive pseudonyms & IDs for testing & exploration use.
[[Category:Genealogy|G]]
