Otto of Verdun, duke of Lorraine

If his mother was born in 886, Otto could not have been born in 888. 907 could be a better estimation.

-https://en.wikipedia.org/wiki/Otto,_Duke_of_Lorraine

-http://fmg.ac/Projects/MedLands/LOTHARINGIAN%20(UPPER)%20NOBILITY.h...
a) OTTO (-943). Widukind names "præfciensque regioni Lothariorum Oddonem, Ricwinus filium, et ut nepotem suum filium Isilberhti, optimæ pulata est coniugio"[1191]. He was installed as OTTO joint Duke of Lotharingia in 940. "Otto…rex" granted property "Nordbelt in villa…Mangunile in comitatu Sointinse" to "viro Volguuin" at the request of "Ottonis ducis" by charter dated 17 Nov 942[1192]. Regino records the death in 943 of "Otto dux"[1193].

Friderada was a ninth-century noblewoman about whom very little is known.
She was probably related to Liudolf, Duke of Saxony.
Friderada married at least three times and was the grandmother of Otto, Duke of Lorraine.

• https://en.wikipedia.org/wiki/Friderada

  ---