Add BCE temporal tags to all documents; add temporal-dating steering doc

legal-codes/twelve-tables.md

@@ -4,10 +4,10 @@
 # Twelve Tables
 
 ## Overview
-The Twelve Tables (~451–450 BCE) were the foundation of Roman law, the first written legal code of the Roman Republic. They were created in response to plebeian demands for publicly accessible laws.
+The Twelve Tables (~451–450 BCE) were the foundation of Roman law, the first written legal code of the Roman Republic. They were created in response to plebeian demands for publicly accessible laws. @t[451 BCE..450 BCE]
 
 ## Key Facts
-- Date: ~451–450 BCE
+- Date: ~451–450 BCE @t[451 BCE..450 BCE]
 - Issuer: Decemviri (commission of ten men)
 - Language: Archaic Latin
 - Context: Conflict of the Orders between patricians and plebeians
@@ -16,13 +16,13 @@ The Twelve Tables (~451–450 BCE) were the foundation of Roman law, the first w
 - Originally inscribed on twelve bronze tablets displayed in the Roman Forum
 - Covered: Court procedure, debt, family law, property, inheritance, torts, public law [^1]
 - Established legal equality (in principle) between patricians and plebeians
-- Prohibited intermarriage between classes (later repealed by *Lex Canuleia*, 445 BCE)
+- Prohibited intermarriage between classes (later repealed by *Lex Canuleia*, 445 BCE) @t[=445 BCE]
 
 ## Significance
 - Foundation of all subsequent Roman law (*ius civile*)
 - First written Roman law, ending patrician monopoly on legal interpretation
 - Roman schoolchildren memorized them for centuries
-- Original tablets lost (possibly in the Gallic sack of Rome, 390 BCE) [^2]
+- Original tablets lost (possibly in the Gallic sack of Rome, 390 BCE) @t[=390 BCE] [^2]
 - Survived through quotations in later Roman legal and literary sources
 
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