Kautilya's Arthashastra 3.1.7

3.1.7

dāyanikṣepopanidhivivāhayuktāḥ strīṇām aniṣkāsinīnāṃ vyādhitānāṃ cāmūḍhasaṃjñānām antaragārakṛtāḥ sidhyeyuḥ //

Those agreements which relate to the division of inheritance, sealed or unsealed deposits, or marriage; or those in which are concerned women who are either afflicted with disease or who do not stir out; as well as those entered into by persons who are not known to be of unsound mind shall be valid though they might be entered into inside houses.