Ex communi clariss. et consultiss. iuris professorum ordinis, in inclyta Basiliensium Academia decreto, subsequentes (de feudis) theses

XLVI.
It is lost by defect, if it is a new fief, for instance, if the vassal is mute, deaf, or incapable; if it is paternal, there is a lengthy distinction.

XLVII.
As for clerics, who are rightly equated with those who are defective and incurable, can they serve through a substitute? I shall defend the position that they cannot, unless this has been usurped by custom.

XLVIII.
There is a great altercation among the doctors of law as to whether it is lost by prescription legal acquisition or loss through the passage of time. I will maintain that it cannot be prescribed against the lord.

XLIX.
By ingratitude and crime committed against the lord, the fief—whether new or paternal—generally returns to the lord, with descendants and agnates excluded, for it is limited in many ways.

L.
If someone is deprived of a paternal fief due to a crime committed against an outsider, it returns to the collateral agnate within the fourth degree inclusively, not to one more near, and much less to a descendant.

LI.
A new fief lost due to a crime committed not against the lord, but against another person, returns to the lord, with all descendants excluded.