Summary

Thomas Barclay 1911 Encyclopædia Britannica, Volume 10… (1911)

Thus a foreign diplomatic agent cannot, like the sovereign he represents, waive his immunity by submitting to the British jurisdiction. The diplomatic immunity necessarily covers the residence of the diplomatic agent, which some writers describe as assimilated to territory of the state represented by the agent; but there is no consideration which can justify any extension of the immunity beyond the needs of the diplomatic mission resident within it. It is different with public ships in foreign waters. In their case the exterritoriality attaches to the vessel.
Source: Wikisource

Thomas Barclay 1911 Encyclopædia Britannica, Volume 10… (1911)

A “foreign sovereign” may be taken to include the president of a republic, and even a potentate whose independence is not complete. Thus in the case, cited above, of Mighell v. Sultan of Johore, the sultan was ascertained to have abandoned all right to contract with foreign states, and to have placed his territory under British protection. The court held that he was, nevertheless, a foreign sovereign in so far as immunity from British jurisdiction was concerned.
Source: Wikisource

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