Theses praediorum militarium 100

35. Adopted and natural sons, even if they are later legitimized, do not succeed the father in the Fief.
36. Parents do not succeed their children in a Fief.
37. In the collateral line, as in the direct, there is no place for representation, except for the sons of deceased brothers, who succeed to a paternal uncle along with their paternal uncles by representation (in stirpes).
38. Those who alone survive succeed per capita.
39. Agnates are called to an ancestral Fief, but not to a new Fief: unless it was expressly agreed upon in the granting of the Fief; or they bought it with the Lord’s knowledge using a common name and money; or they acquired it by war; or they obtained it from the Lord by common service.
40. In the Fief of a Duchy, March, or County, agnates are excluded from succession by the right of primogeniture, provided there are suitable male survivors from the first-born line.
41. An agnate, once the inheritance of the deceased has devolved, can separate feudal property from allodial property, and retain the former by his own right while rejecting the latter.
42. But such a separation is not permitted to a son if the agnates disagree.
43. Collateral cognates are universally excluded from the succession of a Fief.
44. A husband does not succeed his wife unless he has been invested.
45. Furthermore, the beneficiary ought not to worsen the condition of the Fief without the consent of the Lord and the agnates.
46. Neither the whole nor a part of an ancestral Fief can the vassal alienate, unless the Lord and the agnates consent.
47. Nor can he give the same Fief as a pledge under a forfeiture clause (lex commissoria).
48. Yet he is not prohibited from granting it in Fief to another knight, provided there is no fraud or evil intent.
49. Indeed, a vassal can tacitly alienate an ancestral Fief to the nearest agnate.
50. A vassal can renounce a Fief without the consent of the agnates into the same hands of the Lord from whom he had received it, and by the same symbols.
51. And in this case, the agnates shall not have the right of pre-emption (προτιμήσεως).
52. But a surrender of a Fief made in fraud is of no consequence.
53. And those thus surrendering it are held infamous.
54. The Lord can neither transfer the Fief to another, nor [sell] the ownership of the Fief—