How to spawn a named, enchanted, unbreakable sword? [duplicate]

The "Unbreakable" tag is a completely seperate tag from enchantments and belongs in the sword's root json node (inside only the outer set of curly braces). This is not the only problem with your command. The command will not execute first of all because Minecraft commands are case sensitive (the stupidest thing that could be fixed easily but Mojang decides not to) and must be lowercase (changed "Give" to "give"). JSON parsing will fail because there is no semicolon ':' between "Name" and "Valkyrie's Lance". The enchantments are all invalid (and show up as Protection level 0) because of capitalization (caps problems in JSON tags are not a bug, make sure you are using the correct tags and tag capitalization when creating a JSON object. Use the Minecraft Wiki's Chunk Format page for block/entity related NBT tags and the Player.dat Format page for item related NBT tags. Also you had duplicate Fire Aspect enchantments (removed 1)

A correction for your current command would be: /give @p minecraft:diamond_sword 1 0 {display:{Name:"Valkyrie's Lance",Lore:[The Ragnite Hums As The Lance Rests In Your Hands]},ench:[{id:16,lvl:200},{id:19,lvl:3},{id:20,lvl:13},{id:17,lvl:30}],Unbreakable:true}