If you are going to study trusts, you will want to also study tenures, uses, and feudal land law.

If you are going to study equity, you will want to also study English Common Law as well as the Law of Remedies.
Equity is a remedial form of law as well as a branch of the law of remedies as far as divisions and taxonomy goes.

Studying trusts also involve rights, titles, and property both real and personal.

C.C. Langdell has an awesome book on Equity jurisdiction titled A Brief Survey of Equity Jurisdiction.