et ipse Tarquinius iūnior: ‘also a Tarquin (but) younger’ ＝ ‘who was also called Tarquinius’; his praenomen was Sextus.
5. Lucrētiam: for the interesting story of Lucretia, see The Story of the Romans, p. 62.
eandemque: ‘who was also’; H. 508, 3 (451, 3); M. 446, 1; A. & G. 195, e; G. 310; B. 248.
6. stuprāsset: ‘had offered violence to.’ Stuprāsset for stuprāvisset, cf. rēgnāsset, Ch. 4.
7. questa fuisset: for questa esset. Eutropius generally uses essem, etc., in the Pluperfect Passive Subjunctive. For other exceptions see Bk. II, 9, 22. He ordinarily uses fueram, etc., for eram in the Pluperfect Passive Indicative.
8. parēns et ipse: ‘a relative likewise,’ i.e. as well as Collatinus. He was the son of Marcus Iunius and Tarquinia, the second daughter of Tarquinius Superbus. He was called ‘Brutus,’ i.e. ‘the Stupid,’ on account of the mental imbecility he feigned to deceive Tarquinius. Parēns, ‘relative,’ a late meaning.
10. eum: refers to the king.
quī: antecedent is exercitus.
13. rēgnātum est: lit. ‘it was ruled’ ＝ ‘the dynasty lasted.’
14. annīs: Eutropius and some other post-classical writers use the Ablative of Time within which for the Accusative of Duration of Time. The Ablative makes prominent the limits that mark the time.