The Annales Egmundani name "Theoderici V filii Florentii comitis". The Chronologia Johannes de Beke names (in order) "Theodricum et Florencium…et Machtildim" as children of Count Floris & his wife.
He succeeded his father in 1061 as DIRK V Count of Holland, under the regency of his stepfather until 1071. The county of Holland was annexed by the bishopric of Utrecht by Bishop Willem in 1061. "Henricus…rex" confirmed the transfer of "comitatum omnem in Westflinge et circa horas Reni" which "Theodricus comes habuit" to the bishopric of Utrecht, on the advice of "…Gotefridi, Frederici, Gerhardi ducum", by charter dated "II Kal Mai 1064". "Henricus…rex" records that "Theodrico comite eiusque filiis" took property from the bishopric of Utrecht "a tempore Heinrici secundi et Adelboldi…episcopi", including property "Sigeldrith usque in Rinesmuthon, inde sursum ab occidentali parte Reni usque in Bodengrauen" held by "comes Unroch…post Unroch Godezo, post Godezonem Theodricus Baue filius", by charter dated "VI Non Mai 1064". Dirk V recovered his county in 1076, and imprisoned the Bishop. The Chronologia Johannes de Beke records that Count Dirk V defeated his stepfather at "Islemunde" in 1076. "Theodericus…Holtlandensis comes…Florentii filius" recites the ownership history of properties claimed by the church of Utrecht in Holland, including the foundation of Egmond church by "Theodericus, frater Waldgeri, cum legitima coniuge sua Geua", the further construction of the church by "Theodericus secundus, predicti filius, cum Hildegarda coniuge sua", donations by "Ekbertus, nominati comitis filius…Treuerice ecclesie archiepiscopus", by "Arnulfus comes cum…uxore sua Liutgarda", by "Theodericus tertius, predicti Arnulfi filius, cum coniuge sua Othelhildis", by "Sifridus cognomento Sicco, predicti frater Theoderici", by "Florentius, tercii Theoderici filius, cum bone memorie uxore sua Gerthrude", by spurious charter dated 26 Jul 1083, probably written in [1130], which names "Othelhilda uxore mea".
The Annales Egmundani record the death in 1091 of "Theoderici V comes". The Chronologia Johannes de Beke records the death "1091 XV Kal Iul" of Count Dirk V. Beke's Egmondsch Necrologium records the death "1091 V Kal Dec" of "Theodericus quintus Hollandie comes" and his burial "ad caput Florencii Crassi". 1
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