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Books about Thocomerius:
Thocomerius--Negru Voda : un voivod de origine cumana la inceputurile Țarii Romanești : cum a purces intemeierea... by Neagu Djuvara (2007)
Wiki information Thocomerius:
Thocomerius, also Tihomir, was the father of Basarab who would become the first independent voivode of Wallachia. Many Romanian historians think that Thocomerius was a voivode in Wallachia who followed Bărbat; others refer to him as a local potentate...