Here "presence" stands for the people serving as witnesses. Alternate translation: "with my fellow countrymen as my witnesses" (See: [[rc://en/ta/man/jit/figs-metonymy]])
The nominal adjective "dead" can be stated as a verb or simply as "wife." Alternate translation: "your wife who has died" or "your wife" (See: [[rc://en/ta/man/jit/figs-nominaladj]])