A. Raigne of our Soveraigne Lord William
B. messauge and Tenem(en)t with Thappirtenances
C. become due
D. Articles - you were correct
This will mean a legal document of some sort.
'Appirtenances' is usually spelt with a 'u' - appurtenances, but it looks like an 'i' here.
You often get a 'Th' added word instead of writing out 'The'.
Words like 'porcon', 'son', 'sum' and 'menconed' have a little line over them indocating a missing letter(s) - so they should be 'porcion', 'sonne', 'summe' and 'mencioned'.