Annals 11.16 - what does 'eo' mean?

Phoebus Apollo

Civis Illustris
Eodem anno Cheruscorum gens regem Roma petivit, amissis per interna bella nobilibus et uno reliquo stirpis regiae, qui apud urbem habebatur nomine Italicus. paternum huic genus e Flavo fratre Arminii, mater ex Actumero principe Chattorum erat; ipse forma decorus et armis equisque in patrium nostrumque morem exercitus. igitur Caesar auctum pecunia, additis stipatoribus, hortatur gentile decus magno animo capessere: illum primum Romae ortum nec obsidem, sed civem ire externum ad imperium. ac primo laetus Germanis adventus atque eo quod nullis discordiis imbutus pari in omnis studio ageret celebrari, coli, modo comitatem et temperantiam, nulli invisa, saepius vinolentiam ac libidines, grata barbaris, usurpans.

I'm confused as to why Tacitus has written 'eo quod' instead of just 'quod'.

I'm not sure whether
a) 'eo' means 'there' (i.e. Germany)
or
b) it forms a unit with 'quod' to mean something like 'because of the fact that...'. But under 'eo' Lewis & Short, whilst eo can be paired with quod, in the examples given, eo and quod are always in different clauses, so I'm not sure:

(α). [select] a cause or reason, with quia, quoniam, quod, etc.; so with quia: “eo fit, quia mihi plurimum credo,Plaut. Am. 2, 2, 124; id. Capt. 1, 1, 2: “nunc eo videtur foedus, quia, etc.,Ter. Eun. 4, 4, 17; 3, 1, 25: “quia scripseras, eo te censebam, etc.,Cic. Att. 10, 17, 4; Sall. C. 20, 3; Tac. Agr. 22.—With quoniam: “haec eo notavi, quoniam, etc.,Gell. 7, 13.—With quod: “quod ... non potueritis, eo vobis potestas erepta sit,Cic. Verr. 1, 8, 22; Nep. Eum. 11, 5; Liv. 9, 2, 4; Caes. B. G. 1, 23; so, “neque eo ... quod,Ter. Heaut. 3, 2, 43; Varr. R. R. 1, 5.—
 

Bitmap

Civis Illustris
It's b), but I don't think you will find anything in that regard under the dictionary entry eo.

eo quod is essentially the same as idcirco quod.

But under 'eo' Lewis & Short, whilst eo can be paired with quod, in the examples given, eo and quod are always in different clauses
eo and quod are part of different clauses ...
 
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