Syr-RomLaw.26.28 :ܕܡܡܪܚܝܢ ܘܡܙܕܘܓܝܢ ܒܙܘܘܓܐ ܕܐܝܟ ܗܟܢܐ ܗܘ܃ ܡ݂ܢ ܒܠܥܕ ܒܥܘܬܐ ܕܡܠܟܘܬܐ܃ ܒܢ̈ܝܗܘܢ ܠܐ ܢܐܪܬܘܢ‏ : those who dare to join in marriage like (what is disallowed) without royal request, their children will not inherit
See the entire entry for zuwwāḡ, zuwwāḡā v.n.D marriage