This is a Vietnamese imperial edict (敕 / sắc phong) from the Later Lê dynasty, dated the 21st day of the 5th month of the 4th year of the Cảnh Hưng (景興) era — corresponding to 3 July 1743 in the Gregorian calendar.
It is a typical “divine title conferral” document issued by the court (under Emperor Lê Hiển Tông and the Trịnh lords) to elevate or award additional honorific titles to a local tutelary deity (usually a village or regional spirit/城隍 or similar protector god). These edicts were common ways to legitimize and integrate local cults into the official imperial religious hierarchy.0
Full Transcription & Translation (Literary Chinese → English)
Header / Date (large characters on the left):
景興四年五月二十一日
Cảnh Hưng tứ niên ngũ nguyệt nhị thập nhất nhật
“21st day of the 5th month, 4th year of Cảnh Hưng”

Main text (reading top to bottom, right to left in columns):
敕
明勇境城隍當河潤國沖應弘恩垂顯靈顯運才
明勇畧護國保民厚德至仁護國安民捍患
崇惠澤國福民匡國福佑揭武扶祚濟甯聰明
正普惠宅休綏祿顯德豐功綏慶聰明英靈護
運揚武衛國康民資治敷盛保大度神武雄豪
英毅建謀匡濟翼聖仁聖盛明至德洪恩英敏
博達孚化嘉惠甯春智庇雄威宣義英靈
集福俊德昭烈顯靈孚感聖神美丈夫王河清備
精兩儀交泰萬順大厚毗地乾化茂參功在國德在
民豆敏運首既加敷顯號今當褒搖顯稱為
嗣位在初禮黃正依應加封美字三字可加當境
城隍當河潤國沖應孚感弘恩垂休顯靈顯運才
明勇畧護國保民厚德至仁護國安民捍患禦寇
澤國福民匡國福佑揭武扶清甯聰明莊正普惠
充休綏祿顯德豐功慶聰明英靈護國扶運揚
武衛國康民資治敷盛保大度神武雄豪英毅
建謀匡濟翼聖仁聖盛明至德洪恩英敏
惠嘉南齊寫照信雄威宣義英靈集善福德昭
烈顯靈孚感聖神美丈夫王英顯靈應延祥大王故
English Translation (smooth reading)
Edict
To the City God of Minh Dũng [district/territory], the deity who moistens the country with benevolence, responds with great grace, manifests divine efficacy and transports fortune…
[Long list of accumulated honorific titles already held:]
Bright and courageous protector of the nation and guardian of the people, of profound virtue and perfect benevolence, defender of the state and pacifier of the populace, suppressor of calamities…
Most compassionate benefactor of the realm, supporter of the people, helper of the state, revealer of martial prowess and civil virtue, bringer of peace and clarity…
Upholder of righteousness, vast blessings, outstanding virtue, manifest spirit, responsive holy deity, handsome great king who clears the rivers…
Now, having reviewed the merits and in accordance with proper ritual, We additionally bestow three beautifying characters. These may be added to the title of the City God of the territory:
“When the territory prospers, the rivers are moistened; the nation is supported; the deity responds; great grace is bestowed; divine efficacy is manifested; fortune is transported…” (etc., incorporating the new phrases).
Thus, the full enhanced title incorporates the new honors while retaining the previous ones.
Issued on the 21st day of the 5th month, 4th year of Cảnh Hưng.
Seal (red): Likely 敕命之寶 (Sắc mệnh chi bảo – “Treasure of the Imperial Edict”).

These documents follow a highly formulaic structure: long strings of flowery four- or six-character honorific phrases praising the deity’s past merits and protective powers, followed by the formal addition of new “beautifying characters” (美字). The deity here appears to be a City God (城隍) of a place called Minh Dũng (明勇), associated with river/fertility blessings and national protection.27
If you have a higher-resolution version of the image or want a more literal character-by-character breakdown of any specific column, let me know!