For instance, the question, what was a sufficient assignment to give an assign the benefit of a covenant for quiet enjoyment, was argued and decided on the authority of the old cases of warranty. /4/ [379] The assign, as in warranty, came in under the old covenant with the first covenantee, not by any new right of his own. Thus, in an action by an assign on a covenant for further assurance, the defendant set up a release by the original covenantee after the commencement of the suit. The court held that the assignee should have the benefit of the covenant. "They held, that although the breach was in the time of the assignee, yet if the release had been by the covenantee (who is a party to the deed, and from whom the plaintiff derives) before any breach, or before the suit commenced, it had been a good bar to the assignee from bringing this writ of covenant. But the breach of the covenant being in the time of the assignee,... and the action brought by him, and so attached in his person, the covenantee cannot release this action wherein the assignee is interested." /1/ The covenantee even after assignment remains the legal party to the contract. The assign comes in under him, and does not put an end to his control over it, until by breach and action a new right attaches in the assign's person, distinct from the rights derived from the persona of his grantor. Later, the assign got a more independent standing, as the original foundation of his rights sunk gradually out of sight, and a release after assignment became ineffectual, at least in the case of a covenant to pay rent. /2/ Only privies in estate with the original covenantee can have the benefit of covenants for title. It has been shown that a similar limitation of the benefits of the ancient [380] warranty was required by its earlier history before the assign was allowed to sue, and that the fiction by which he got that right could not extend it beyond that limit. This analogy also was followed. For instance, a tenant in tail male made a lease for years with covenants of right to let and for quiet enjoyment, and then died without issue male. The lessee assigned the lease to the plaintiff. The latter was soon turned out, and thereupon brought an action upon the covenant against the executor of the lessor. It was held that he could not recover, because he was not privy in estate with the original covenantee. For the lease, which was the original covenantee's estate, was ended by the death of the lessor and termination of the estate tail out of which the lease was granted, before the form of assignment to the plaintiff. /1/